The Vision for Space Exploration

Message from

the NASA Administrator

Dear Reader,

With last year’s budget, NASA released a new Strategic Plan outlining a
new approach to space exploration using a “building block” strategy to
explore scientifically valuable destinations across our solar system. At
the same time that we released the Strategic Plan, our Nation and the
NASA family also suffered the loss of the seven brave astronauts aboard
the Space Shuttle

Columbia

. The report of the

Columbia

Accident

Investigation Board emphasized the need for a clearer direction from
which to drive NASA’s human exploration agenda. On January 14,
2004, the President articulated a new vision for space exploration.

You hold in your hands a new, bolder framework for exploring our solar system that builds upon the policy
that was announced by the President after months of careful deliberations within the Administration. This
plan does not undertake exploration merely for the sake of adventure, however exciting that may be, but
seeks answers to profound scientific and philosophical questions, responds to recent discoveries, will put in
place revolutionary technologies and capabilities for the future, and will genuinely inspire our Nation, the
world, and the next generation.

Our aim is to explore in a sustainable, affordable, and flexible manner. We believe the principles and
roadmap set down in this document will stand the test of time. Its details will be subject to revision and
expansion as new discoveries are made, new technologies are applied, and new challenges are met and over-
come. This plan is guided by the Administration’s new space exploration policy, “A Renewed Spirit of
Discovery: The President’s Vision for U.S. Space Exploration,” a copy of which is provided on the follow-
ing pages. NASA is releasing this plan simultaneously with NASA’s FY 2005 Budget Justification. This
plan is fiscally responsible, consistent with the Administration’s goal of cutting the budget deficit in half
within the next five years.

I cannot overstate how much NASA will change in the coming years as this plan is implemented. I also can-
not overstate how profound the rewards will be on this new course. With the support of Congress, the sci-
ence community, the NASA civil and contractor workforce, and most importantly, the American public, we
will embark on this very exciting future.

When Christopher Columbus made his voyages across the Atlantic in the 15th and 16th centuries, his ships
carried the inscription “Following the light of the sun, we left the Old World.” I look forward to joining you
as we follow the light of the planets and the stars into the new worlds of the 21st century.

Sean O'Keefe
Administrator

A Renewed Spirit of Discovery:

The President’s Vision

for U.S. Space Exploration

Background

From the Apollo landings on the Moon, to robotic surveys of the Sun and the planets, to the compelling
images captured by advanced space telescopes, U.S. achievements in space have revolutionized humanity’s
view of the universe and have inspired Americans and people around the world. These achievements also
have led to the development of technologies that have widespread applications to address problems on Earth.
As the world enters the second century of powered flight, it is time to articulate a new vision that will define
and guide U.S. space exploration activities for the next several decades.

Today, humanity has the potential to seek answers to the most fundamental questions posed about the exis-
tence of life beyond Earth. Telescopes have found planets around other stars. Robotic probes have identified
potential resources on the Moon, and evidence of water -- a key ingredient for life -- has been found on Mars
and the moons of Jupiter.

Direct human experience in space has fundamentally altered our perspective of humanity and our place in
the universe. Humans have the ability to respond to the unexpected developments inherent in space travel
and possess unique skills that enhance discoveries. Just as Mercury, Gemini, and Apollo challenged a gen-
eration of Americans, a renewed U.S. space exploration program with a significant human component can
inspire us -- and our youth -- to greater achievements on Earth and in space.

The loss of Space Shuttles

Challenger

and

Columbia

and their crews are a stark reminder of the inherent

risks of space flight and the severity of the challenges posed by space exploration. In preparation for future
human exploration, we must advance our ability to live and work safely in space and, at the same time,
develop the technologies to extend humanity’s reach to the Moon, Mars, and beyond. The new technologies
required for further space exploration also will improve the Nation’s other space activities and may provide
applications that could be used to address problems on Earth.

Like the explorers of the past and the pioneers of flight in the last century, we cannot today identify all that
we will gain from space exploration; we are confident, nonetheless, that the eventual return will be great.
Like their efforts, the success of future U.S. space exploration will unfold over generations.

Goal and Objectives

The fundamental goal of this vision is to advance U.S. scientific, security, and economic interests through a
robust space exploration program. In support of this goal, the United States will:

• Implement a sustained and affordable human and robotic program to explore the solar system and

beyond;

• Extend human presence across the solar system, starting with a human return to the Moon by the year

2020, in preparation for human exploration of Mars and other destinations;

• Develop the innovative technologies, knowledge, and infrastructures both to explore and to support

decisions about the destinations for human exploration; and

• Promote international and commercial participation in exploration to further U.S. scientific, security,

and economic interests.

Bringing the Vision to Reality

The Administrator of the National Aeronautics and Space Administration will be responsible for the plans,
programs, and activities required to implement this vision, in coordination with other agencies, as deemed
appropriate. The Administrator will plan and implement an integrated, long-term robotic and human explo-
ration program structured with measurable milestones and executed on the basis of available resources, accu-
mulated experience, and technology readiness.

To implement this vision, the Administrator will conduct the following activities and take other actions as
required:

A. Exploration Activities in Low Earth Orbit

Space Shuttle

• Return the Space Shuttle to flight as soon as practical, based on the recommendations of the Columbia

Accident Investigation Board;

• Focus use of the Space Shuttle to complete assembly of the International Space Station; and

• Retire the Space Shuttle as soon as assembly of the International Space Station is completed, planned

for the end of this decade;

International Space Station

• Complete assembly of the International Space Station, including the U.S. components that support

U.S. space exploration goals and those provided by foreign partners, planned for the end of this
decade;

• Focus U.S. research and use of the International Space Station on supporting space exploration goals,

with emphasis on understanding how the space environment affects astronaut health and capabilities
and developing countermeasures; and

• Conduct International Space Station activities in a manner consistent with U.S. obligations contained

in the agreements between the United States and other partners in the International Space Station.

B. Space Exploration Beyond Low Earth Orbit

The Moon

• Undertake lunar exploration activities to enable sustained human and robotic exploration of Mars and

more distant destinations in the solar system;

• Starting no later than 2008, initiate a series of robotic missions to the Moon to prepare for and support

future human exploration activities;

• Conduct the first extended human expedition to the lunar surface as early as 2015, but no later than

the year 2020; and

• Use lunar exploration activities to further science, and to develop and test new approaches,

technologies, and systems, including use of lunar and other space resources, to support sustained
human space exploration to Mars and other destinations.

Mars and Other Destinations

• Conduct robotic exploration of Mars to search for evidence of life, to understand the history of the

solar system, and to prepare for future human exploration;

• Conduct robotic exploration across the solar system for scientific purposes and to support human

exploration. In particular, explore Jupiter’s moons, asteroids and other bodies to search for evidence
of life, to understand the history of the solar system, and to search for resources;

• Conduct advanced telescope searches for Earth-like planets and habitable environments around other

stars;

• Develop and demonstrate power generation, propulsion, life support, and other key capabilities

required to support more distant, more capable, and/or longer duration human and robotic exploration
of Mars and other destinations; and

• Conduct human expeditions to Mars after acquiring adequate knowledge about the planet using

robotic missions and after successfully demonstrating sustained human exploration missions to the
Moon.

C. Space Transportation Capabilities Supporting Exploration

• Develop a new crew exploration vehicle to provide crew transportation for missions beyond low Earth

orbit;

« Conduct the initial test flight before the end of this decade in order to provide an operational

capability to support human exploration missions no later than 2014;

• Separate to the maximum practical extent crew from cargo transportation to the International Space

Station and for launching exploration missions beyond low Earth orbit;

« Acquire cargo transportation as soon as practical and affordable to support missions to and from

the International Space Station; and

« Acquire crew transportation to and from the International Space Station, as required, after the

Space Shuttle is retired from service.

D. International and Commercial Participation

• Pursue opportunities for international participation to support U.S. space exploration goals; and

• Pursue commercial opportunities for providing transportation and other services supporting the

International Space Station and exploration missions beyond low Earth orbit.

P R E S I D E N T G E O R G E W . B U S H

J A N U A R Y 1 4 , 2 0 0 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

NASA Guiding Principles for Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Solar System and Beyond—Exploration Roadmap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Lunar Testbeds and Missions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Mars Research, Testbeds, and Missions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Outer Moons Research and Missions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Extrasolar Planet Research and Observatories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Exploration Building Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

NASA Transformation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

National Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Table of Contents

Left: An artist’s concept of a spacecraft, equipped with a centrifuge
and nuclear–electric propulsion, traveling to Mars.

National Aeronautics and
Space Administration

Introduction

“The American experience stirred mankind from discovery to exploration. From the
cautious question of what they knew was out there . . . into an enthusiastic reaching
to the unknown.”

Daniel J. Boorstin (1914– )

“Somewhere, something incredible is waiting to be known.”

Carl Sagan (1934–1996)

Understanding from the unknown. Comprehension
from the cosmos. Insight from the infinite. The rela-
tionship between discovery and exploration has driv-
en human curiosity for all of recorded history. Since
the time of the ancient philosophers, we have striven
to comprehend our place in the universe and have
looked to the heavens for answers to the questions:
Where do we come from? Are we alone? Where are
we going?

Exploration and discovery have been especially
important to the American experience. New World
pioneers and American frontiersmen showed our
Nation the importance of the knowledge, technolo-
gy, resources, and inspiration that flow from explo-
ration. Like the ancients, America has also explored
the heavens, and in the latter half of the 20th centu-
ry, the Apollo Moon landings became the most dis-
tant milestone in the continuing American explorato-
ry tradition.

At the beginning of the 21st century, we stand at a
unique time in our exploration of the heavens. The
exploratory voyages of the next few decades have
the potential—within our lifetimes—to answer age-
old questions about how life begins, whether life
exists elsewhere, and how we could live out there.

Our understanding of the universe and its habitabili-
ty is being revolutionized by new discoveries.
Scientists have found new forms of life in environ-
ments once thought inhospitable. Spacecraft have
identified potential new resources on the Moon.
Robotic probes have found evidence of water, a key
ingredient of life, on the planet Mars. A mission to
Jupiter has revealed that oceans likely underlay the
icy surfaces of that planet’s moons. Astronomers
have discovered over 100 planets, and counting, cir-
cling other stars. Together, these findings indicate
that our universe may be more habitable than previ-
ously known. Instead of a dry, lifeless universe,
there may be many worlds that harbored life in the
past and can support life today.

We also stand at a pivotal time in the history of
human space flight, when important choices about
investments in the Space Shuttle, the International
Space Station, and follow-on programs are being
made in the wake of the Space Shuttle

Columbia

tragedy. Just as decisions to begin the Space Station
and Space Shuttle programs were made 20 and 30
years ago, the direction we set for our human space
flight programs today will define space exploration
for decades to come.

The President’s Vision for space exploration is bold
and forward-thinking. It expands scientific discov-
ery and the search for habitable environments and
life by advancing human and robotic capabilities
across multiple worlds. This plan provides the
framework for fulfilling the President’s direction,
guided by the principles on the facing page. It is
responsive to recent science findings, the NASA
Strategic Plan, the report of the

Columbia

Accident

Investigation Board, and the new space exploration
policy. It seeks to establish a sustainable and flexi-
ble approach to exploration by pursuing compelling
questions, developing breakthrough technologies,
leveraging space resources, and making smart deci-
sions about ongoing programs. It will help drive
critical national technologies in power, computing,
nanotechnology, biotechnology, communications,
networking, robotics, and materials. It will start
exciting new programs now to inspire the next gen-
eration of explorers.

Our generation inherited great legacies from the
exploratory voyages and discoveries of earlier cen-
turies. Starting with an exploration roadmap (see
page 4), this document outlines a plan for achieving
great legacies that our century can leave to future
generations.

The Vision for

Space Exploration

NASA Guiding Principles for Exploration

Pursue Compelling Questions

Exploration of the solar system and beyond will be guided by compelling questions of scientific and socie-
tal importance. NASA exploration programs will seek profound answers to questions about the origins of
our solar system, whether life exists beyond Earth, and how we could live on other worlds.

Across Multiple Worlds

NASA will make progress across a broad front of destinations, starting with a return to the Moon to enable
future human exploration of Mars and other worlds. Consistent with recent discoveries, NASA will focus
on possible habitable environments on Mars, the moons of Jupiter, and in other solar systems. Where advan-
tageous, NASA will also make use of destinations like the Moon and near-Earth asteroids to test and demon-
strate new exploration capabilities.

Employ Human and Robotic Capabilities

NASA will send human and robotic explorers as partners, leveraging the capabilities of each where most use-
ful. Robotic explorers will visit new worlds first, to obtain scientific data, assess risks to our astronauts,
demonstrate breakthrough technologies, identify space resources, and send tantalizing imagery back to
Earth. Human explorers will follow to conduct in-depth research, direct and upgrade advanced robotic
explorers, prepare space resources, and demonstrate new exploration capabilities.

For Sustainable Exploration

NASA will pursue breakthrough technologies, investigate lunar and other space resources, and align ongo-
ing programs to develop sustainable, affordable, and flexible solar system exploration strategies.

Use the Moon as a Testing Ground For Mars and Beyond

Under this new Vision, the first robotic missions will be sent to the Moon as early as 2008 and the first
human missions as early as 2015 to test new approaches, systems and operations for sustainable human and
robotic missions to Mars and beyond.

Starting Now

NASA will pursue this Vision as our highest priority. Consistent with the FY 2005 Budget, NASA will
immediately begin to realign programs and organization, demonstrate new technical capabilities, and under-
take new robotic precursor missions to the Moon and Mars before the end of the decade.

The Vision for

Space Exploration

Solar System and Beyond—

Exploration Roadmap

Over the next three decades, NASA will send robotic probes to explore
our solar system, including our Earth’s Moon, the planet Mars, the
moons of Jupiter and other outer planets, and will launch new space tel-
escopes to search for planets beyond our solar system. These robotic
explorers will pursue compelling scientific questions, demonstrate
breakthrough technologies, identify space resources, and extend an
advanced telepresence that will send stunning imagery back to Earth.

Starting at the Moon in 2008 and at Mars in 2011, NASA will launch
dedicated robotic missions that will demonstrate new technologies and
enhance our scientific knowledge of these destinations. These new
technologies and discoveries will pave the way for more capable robot-
ic missions and eventually human missions. The first human explorers
will be sent to the Moon as early as 2015, as a stepping stone to demon-
strate sustainable approaches to exploring Mars and other worlds.

To support these missions, a number of key building blocks are neces-
sary. These include new capabilities in propulsion, power, communica-
tions, crew transport, and launch, as well as the refocusing of ongoing
programs like Space Station research. Major achievements, including
the completion of Space Station assembly, test flights of new crew
transport capabilities, and space technology demonstrations, are expect-
ed before the end of this decade.

The activities in each of the sections in this roadmap, Moon, Mars,
Outer Moons, Extrasolar Planets, and Exploration Building Blocks, are
described in detail on the following pages. Sections describing changes
in the NASA organization and resources to implement this plan are also
included.

Right: The International Space Station as seen
from the Shuttle

Endeavour

The Vision for

Space Exploration

Lunar Testbeds and Missions

“The moon is a silver pin-head vast,
That holds the heaven’s tent-hangings fast.”

William R. Alger (1823–1905)
“The Use of the Moon,”

Oriental Poetry

During the late 1960s and early 1970s, the Apollo
program demonstrated American technical strength
in a race against the Soviet Union to land humans on
the Moon. Today, NASA’s plans for a return to the
Moon are not driven by Cold War competition, but
by the need to test new exploration technologies and
skills on the path to Mars and beyond. Additionally,
during the 1990s, robotic missions identified poten-
tial evidence of water ice at the Moon’s poles, a
resource that could make exploration further into the
solar system easier to conduct.

NASA will begin its lunar testbed program with a
series of robotic missions. The first, an orbiter to
confirm and map lunar resources in detail, will
launch in 2008. A robotic landing will follow
in 2009 to begin demonstrating capabilities for sus-
tainable exploration of the solar system. Additional
missions, potentially up to one a year, are planned to
demonstrate new capabilities such as robotic net-
works, reusable planetary landing and launch sys-
tems, pre-positioned propellants, and resource
extraction.

A human mission to the Moon will follow these

robotic missions as early as 2015. The Moon will
provide an operational environment where we can
demonstrate human exploration capabilities within
relatively safe reach of Earth. Human missions to
the Moon will serve as precursors for human mis-
sions to Mars and other destinations, testing new
sustainable exploration approaches, such as space
resource utilization, and human-scale exploration
systems, such as surface power, habitation and life
support, and planetary mobility. The scope and
types of human lunar missions and systems will be
determined by their support to furthering science,
developing and testing new approaches, and their
applicability to supporting sustained human space
exploration to Mars and other destinations.

The major focus of these lunar activities will be
on demonstrating capabilities to conduct sustained
research on Mars and increasingly deep and more
advanced exploration of our solar system.
Additionally, these robotic and human missions will
pursue scientific investigations on the Moon, such
as uncovering geological records of our early solar
system.

The Vision for

Space Exploration

Mars Research, Testbeds, and Missions

“We shall never cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time.”

T.S. Eliot (1888–1965)

As early as the 19th century, telescope observations
led some astronomers to speculate that Mars might
harbor life. Subsequent robotic missions to Mars
during the 1960s and 1970s showed that the surface
of Mars is currently inhospitable. However, more
recent missions have transformed our understanding
of Mars. New data indicates that liquid water likely
flowed across the surface of Mars in the distant past
and may still exist in large reservoirs deep under-
ground. This raises the prospect that simple forms of
life may have developed early in Mars’ history and
may persist beneath the surface of Mars to this day.

NASA is aggressively pursuing the search for water
and life on Mars using robotic explorers. The Spirit
and Opportunity rovers that landed on Mars in
January 2004 are the latest in a series of research
missions planned to explore Mars through 2010. By
the end of this decade, three rovers, a lander, and two
orbiters will have visited the planet. NASA will aug-
ment this program and prepare for the next decade of
Mars research missions by investing in key capabil-
ities to enable advanced robotic missions, such as
returning geological samples from Mars or drilling
under the surface of Mars. This suite of technologies
will enable NASA to rapidly respond to discoveries
this decade and pursue the search for water and life
at Mars wherever it may lead next decade.

Starting in 2011, NASA will also launch the first in
a new series of human precursor missions to Mars.

These robotic testbeds will demonstrate technolo-
gies—such as improved aerodynamic entry, Mars
orbital rendezvous and docking, precision landing,
resource extraction and utilization, and optical com-
munications—that can greatly enhance future robot-
ic capabilities and are key to enabling future human
Mars missions. These missions will also obtain crit-
ical data for future human missions on chemical haz-
ards, resource locations, and research sites. They
may prepare resources and sites in anticipation of
human landings.

The first human mission beyond the Moon will be
determined on the basis of available resources, accu-
mulated experience, and technology readiness.
Potential candidates that might be considered
include circumnavigating Mars, visiting a near-Earth
asteroid, or erecting or upgrading a deep space tele-
scope. Such missions could test the human-scale
power, propulsion, and other transit systems neces-
sary to take trips to Mars before taking on the addi-
tional risk of a landing on Mars.

The timing of the first human research missions to
Mars will depend on discoveries from robotic
explorers, the development of techniques to mitigate
Mars hazards, advances in capabilities for sustain-
able exploration, and available resources.

Outer Moons Research and Missions

“Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.”

Arthur C. Clarke (1917– )

In 1610, the Italian astronomer Galileo Galilei
discovered that four large moons circle the planet
Jupiter. In the 1970s, NASA’s twin Voyager mis-
sions flew by Jupiter and confirmed that three of
these moons—Europa, Callisto, and Ganymede—
are covered in water ice. Twenty years later, anoth-
er NASA mission to Jupiter named after Galileo
found evidence that enormous, planet-wide oceans
likely lay underneath the icy surfaces of these
moons. As on Mars, the presence of liquid water
raises the prospect that life could have developed on
one or more of these moons and may still swim in
their oceans today.

NASA is in the early stages of planning a mission
that will visit Europa, Callisto, and Ganymede dur-
ing the next decade. Unlike the Voyager and Galileo
missions, which could only briefly fly by Jupiter’s
moons, the Jupiter Icy Moons Orbiter will be
designed to circle each moon for up to a year, carry-
ing revolutionary science instruments. This will
allow the lengthy and detailed investigations neces-
sary to confirm and map the underground oceans of
these worlds in detail.

The Jupiter Icy Moons Orbiter is enabled by Project
Prometheus, NASA’s program to develop space
nuclear power and propulsion technology. The
nuclear power and nuclear-electric propulsion tech-
nologies that support this mission are also key to

enabling other advanced robotic missions and
human missions beyond Earth’s orbit. In addition to
mapping new oceans, the systems on the Jupiter Icy
Moons Orbiter will be a forerunner of the systems
needed to send humans to other worlds, to supply
power for human expeditions on these worlds, and to
pursue other challenging robotic science missions.

The moons of other planets in our outer solar system
may also hold critical clues to the evolution of hab-
itable environments and the development of life.
NASA’s Cassini mission, currently on its way to
Saturn, will encounter Saturn’s largest moon, Titan,
next January. Titan is icy like Jupiter’s moons, but
unlike Europa, Callisto, and Ganymede, Titan has an
atmosphere that is about as dense as Earth’s, is com-
posed of many of the same chemicals as Earth’s
early atmosphere, and is believed to contain com-
plex, pre-biotic chemistry. Titan may turn out to be
a key laboratory for understanding how biology aris-
es from chemistry.

Depending on the results from Cassini and the
Jupiter Icy Moons Orbiter, NASA experts believe
that advanced robotic missions to study the habitable
environments of the outer moons in detail—such as
submarines on Europa or balloons on Titan—are
likely after 2020. Over the long term, a human
research presence at some of these worlds may also
become desirable.

The Vision for

Space Exploration

The Vision for

Space Exploration

Extrasolar Planet Research

and Observatories

“Do there exist many worlds, or is there but a single world? This is one of the most
noble and exalted questions in the study of Nature.”

Albertus Magnus (1193–1280)

“We may object that we have been thinking of the stars as mere bodies . . . but should
rather conceive them as enjoying life and action. On this view the facts cease to
appear surprising.”

Aristotle (384–322 BC)

On the Heavens

, Book II, Part 12

Our solar system is composed of nine planets,
including Earth, that circle a central star, the Sun.
Astronomers and philosophers have speculated for
millennia about whether other stars harbor worlds
like Earth and whether these worlds are inhabited.
However, it is only in the last decade that telescopes
have become powerful enough to detect whether
planets of any type circle other stars. In 1995,
astronomers discovered the first solar system besides
our own. Since then, astronomers have found over
100 planets orbiting other stars—and the number
continues to climb with new discoveries.

All of the extrasolar planets discovered to date are
either very large planets or planets that circle very
close to their parent stars. Some extrasolar planets
are many times larger than the largest planet in our
solar system, Jupiter, and orbit even closer to their
parent star than the closest planet to our Sun,
Mercury. Because of the obscuring effects of the
Earth’s atmosphere, the detection and characteriza-
tion of small planets with normal orbits like Earth is
extremely challenging using ground-based tele-
scopes.

NASA’s Astronomical Search for Origins program
will use a variety of techniques this decade to great-
ly expand the number and variety of known extraso-
lar planets. New space telescopes like the Spitzer
and James Webb Space Telescopes, the Kepler mis-
sion, and the Space Interferometry mission, will
search newly formed planets circling young stars,
take planetary surveys of thousands of faraway stars,
and detect planets only a few times larger than Earth
around very nearby stars.

The results from these telescopes will be used in
the design of an advanced space telescope, the
Terrestrial Planet Finder, to be launched during the
next decade. The Terrestrial Planet Finder will be
capable of finding Earth-like planets and detecting
the chemicals in their atmospheres. Just as plants
and animals have changed Earth’s atmosphere over
time, the detection of specific chemicals on other
worlds would indicate that life has evolved on them,
as well.

If the Terrestrial Planet Finder discovers extrasolar
planets with evidence of life, NASA would pursue
additional space telescopes after 2020 that can con-
firm the existence of life on these worlds and image
their features. Life Finder or Planet Imager tele-
scopes would likely be very large and complex
spacecraft located far from Earth. A human presence
in deep space could be necessary to help erect and
upgrade such future telescopes.

The Vision for

Space Exploration

Exploration Building Blocks

“As for the future, your task is not to see it, but to enable it.”

Antoine de-Saint Exupery (1900–1944)

The Wisdom of the Sands

“Man hath weaved out a net, and this net throwne upon the Heavens, and now
they are his own.”

John Donne (1572–1631)

To conduct an effective and exciting program of
exploration and discovery, we must overcome the
limitations of space, time, and energy, as well as var-
ious space hazards. Over the next two decades,
NASA plans to develop a number of new capabilities
that are critical to enabling the human and robotic
missions described in this document.

For human explorers to undertake lengthy research
trips on other worlds, they will have to maintain their
health in environments that possess higher radiation
and lower gravity than Earth and that are far from
supplies and medical expertise. Research aboard the
International Space Station and at various laborato-
ries on Earth is critical to understanding the effects
of space environments on the human body, develop-
ing techniques for mitigating these hazards, mini-
mizing the logistical burden of supporting humans
far from Earth, and addressing remote medical emer-
gencies. NASA plans to complete assembly of the
Space Station, including international partner ele-
ments, by the end of the decade. NASA will also
augment its bioastronautics research program with
the goal that Space Station research necessary to
support human explorers on other worlds will be
complete by 2016.

The Space Shuttle will be critical to completing
assembly of the Space Station. With Space Station
assembly complete at the end of this decade, NASA
will retire the Space Shuttle and put crew and
cargo on different launches, a safer approach to crew
transport.

NASA will initiate Project Constellation to develop a
new Crew Exploration Vehicle for future crew trans-
port. This vehicle will be developed in stages, with
the first automated test flight in 2008, more
advanced test flights soon thereafter, and a fully
operational capability no later than 2014. The
design of the Crew Exploration Vehicle will be driv-
en by the needs of the future human exploration

missions described in this document. The Crew
Exploration Vehicle might also supplement interna-
tional partner crew transport systems to the Space
Station.

For cargo transport to the Space Station after 2010,
NASA will rely on existing or new commercial
cargo transport systems, as well as international part-
ner cargo transport systems. NASA does not plan to
develop new launch vehicle capabilities except
where critical NASA needs—such as heavy lift—are
not met by commercial or military systems.
Depending on future human mission designs, NASA
could decide to develop or acquire a heavy lift vehi-
cle later this decade. Such a vehicle could be
derived from elements of the Space Shuttle, existing
commercial launch vehicles, or new designs.

In the days of the Apollo program, human explo-
ration systems employed expendable, single-use
vehicles requiring large ground crews and careful
monitoring. For future, sustainable exploration pro-
grams, NASA requires cost-effective vehicles that
may be reused, have systems that could be applied
to more than one destination, and are highly reliable
and need only small ground crews. NASA plans
to invest in a number of new approaches to explo-
ration, such as robotic networks, modular systems,
pre-positioned propellants, advanced power and
propulsion, and in-space assembly, that could enable
these kinds of vehicles. These technologies will be
demonstrated on the ground, at the Space Station and
other locations in Earth orbit, and on the Moon start-
ing this decade and into the next. Other break-
through technologies, such as nuclear power and
propulsion, optical communications, and potential
use of space resources, will be demonstrated as part
of robotic exploration missions. The challenges of
designing these systems will accelerate the develop-
ment of fundamental technologies that are critical
not only to NASA, but also to the Nation’s econom-
ic and national security.

The Vision for

Space Exploration

NASA Transformation

“No one regards what is before his feet; we all gaze at the stars.”

Quintus Ennius (239–169 BC)

To successfully execute the President’s vision,
NASA will refocus its organization, create new
offices where necessary, realign ongoing programs
and personnel, experiment with new ways of doing
business, and tap the great innovative and creative
talents of our Nation.

Prior to this plan, six Enterprises comprised NASA’s
organization—Space Science, Earth Science,
Biological and Physical Research, Aerospace
Technology, Education, and Space Flight. To devel-
op the exploration building blocks described in this
document, NASA has created a new Exploration
Systems Enterprise. Exploration Systems will be
initially responsible for developing the solar system
exploration vehicles and technologies described in
this plan, including the Crew Exploration Vehicle,
nuclear power and propulsion systems, and neces-
sary supporting technologies. Relevant elements of
the Aerospace Technology, Space Science, and
Space Flight enterprises were transferred to the
Exploration Systems Enterprise. The Aerospace
Technology Enterprise was renamed the Aeronautics
Enterprise.

In the past, NASA’s human space flight programs
and robotic exploration programs have largely oper-
ated independently of each other. As human explor-
ers prepare to join their robotic counterparts, closer
coordination and integration will be necessary. The
Exploration Systems Enterprise will work closely
with the Space Science Enterprise to use the Moon
as a testing ground for solar system exploration vehi-
cles and technologies.

NASA’s Space Science Enterprise will have respon-
sibility for carrying out robotic testbeds on the Moon
and Mars and will also demonstrate other key tech-
nologies for human and robotic exploration in other
missions to Mars and the outer moons. NASA’s
Space Science Enterprise will eventually need to
integrate human capabilities into Mars science plan-
ning, and potentially deep space observatory or outer
moon planning.

Many other elements of the NASA organization will
be focused to support this new direction. NASA’s

Biological and Physical Research Enterprise will put
much greater emphasis on bioastronautics research
to enable human exploration of other worlds.
Similarly, Space Station research will be prioritized
to support human exploration.

NASA’s Office of the Space Architect will be
responsible for coordinating and integrating the
exploration activities of NASA’s different
Enterprises and for maintaining exploration
roadmaps and high-level requirements.

As we move outward into the solar system, NASA
will rely more heavily on private sector space capa-
bilities to support activities in Earth orbit and future
exploration activities. In particular, NASA will seek
to use existing or new commercial launch vehicles
for cargo transport to the Space Station, and poten-
tially to the Moon and other destinations.

Building on its long history and extensive and close
ties with the space and research agencies of other
nations, NASA will also actively seek international
partners and work with the space agencies of these
partners in executing future exploration activities.

Many of the technical challenges that NASA will
face in the coming years will require innovative
solutions. In addition to tapping creative thinking
within the NASA organization, NASA will need to
leverage the ideas and expertise resident in the
Nation’s universities and industry. One way that
NASA plans to do this is through a series of
Centennial Challenges. As in the barnstorming days
of early aviation, NASA plans to establish prizes for
specific accomplishments that advance solar system
exploration and other NASA goals.

NASA will also invigorate its workforce, focus its
facilities, and revitalize its field centers. Congress is
reviewing human capital legislation that will provide
NASA with necessary workforce tools. NASA is
also planning to phase out older, underutilized build-
ings and facilities. As exploration activities get
underway, NASA anticipates additional planning,
reviews, and changes to align and improve its infra-
structure.

The Vision for

Space Exploration

Resources

To confine our attention to terrestrial matters would be to limit the human spirit.

Stephen Hawking (1942– )

The President’s Vision for solar system exploration
is affordable in both the short-term and the long-
term. NASA’s budget will increase by five percent
per year over the next three years and at about one
percent for the following two years.

Although the budget increases are modest, NASA
will be able to carry out a robust exploration pro-
gram. NASA will free up resources in its budget in

three ways: holding down growth in existing pro-
grams that do not support the vision; retiring the
Space Shuttle to free up billions of dollars in the next
decade; and focusing on innovations that reduce the
cost of sustained space operations. The chart above
reflects the shift in funding that will occur over time
as the new vision for human and robotic exploration
of the solar system and beyond is implemented.

Exploration Strategy Based on Long-Term Affordability

The Vision for

Space Exploration

National Benefits

Just as Meriwether Lewis and William Clark could
not have predicted the settlement of the American
West within a hundred years of the start of their
famous 19th century expedition, the total benefits of
a single exploratory undertaking or discovery cannot
be predicted in advance. Because the very purpose
of exploratory voyages and research is to understand
the unknown, exact benefits defy calculation.
Nonetheless, we can define important categories of
benefits to the Nation and society.

Preparing for exploration and research accelerates
the development of technologies that are important
to the economy and national security. The space
missions in this plan require advanced systems and
capabilities that will accelerate the development of
many critical technologies, including power, com-
puting, nanotechnology, biotechnology, communica-
tions, networking, robotics, and materials. These
technologies underpin and advance the U.S. econo-
my and help ensure national security. NASA plans
to work with other government agencies and the pri-
vate sector to develop space systems that can address
national and commercial needs.

Space exploration holds a special place in the human
imagination. Youth are especially drawn to Mars
rovers, astronauts, and telescopes. If engaged effec-
tively and creatively, space inspires children to seek
careers in math, science, and engineering, careers

that are critical to our future national economic com-
petitiveness.

The accomplishments of U.S. space explorers are
also a particularly potent symbol of American
democracy, a reminder of what the human spirit can
achieve in a free society. However, space explo-
ration also encourages international cooperation,
where spacecraft and explorers come to represent
our world as well as our Nation.

When the unknown becomes known, it catalyzes
change, stimulating human thought, creativity and
imagination. The scientific questions that this plan
pursues have the potential to revolutionize whole
fields of research. For example, scientists are still
working to understand how similarly sized planets,
such as Mars and Earth, could have developed so
differently and what that could mean for our planet.
If life is found beyond Earth, biological processes on
other worlds may be very different from those
evolved on our world. Outside the sciences, the very
knowledge that life exists elsewhere in the universe
may hold revelations for fields in the humanities.

Exploration and discovery are key agents of growth
in society—technologically, economically, socially,
internationally, and intellectually. This plan sets
in motion activities that will contribute to change
and growth in the U.S. and the world over the next
century.

NASA research stimulates and inspires young minds and
provides critical technologies for the Nation.

“Mankind is drawn to the heavens for the same reason we were once drawn into
unknown lands and across the open sea. We choose to explore space because doing
so improves our lives, and lifts our national spirit.”

President George W. Bush
January 14, 2004

National Aeronautics and
Space Administration

Above: An artist’s drawing of a human exploration base on Callisto, Jupiter’s
second largest moon.

Image Credits

Page vi

An artist’s concept of a spacecraft, equipped with a centrifuge and nuclear–electric propulsion, traveling to

Mars, John Frassanito and Associates.

Page 6

An artist’s concept of lunar exploration, John Frassanito and Associates.

Page 8

A drawing of astronauts and robots exploring Mars, John Frassanito and Associates.

Page 12 A drawing of astronauts and advanced robotic assistants building a space telescope, Pat Rawlings, SAIC.

Below

Analytical Mechanics Associates.

Editing, layout, and design by The Tauri Group, LLC, and Eileen Schramm visual communication.