"Since, in the long run, every planetary civilization will be endangered
by impacts from space, every surviving civilization is obliged to become
spacefaring--not because of exploratory or romantic zeal, but for the most
practical reason imaginable: staying alive... If our long-term survival is
at stake, we have a basic responsibility to our species to venture to other
worlds."
Carl Sagan, Pale Blue Dot, 1994
"I don't think the human race will survive the next thousand years,
unless we spread into space. There are too many accidents that can befall
life on a single planet. But I'm an optimist. We will reach out to the
stars."
Stephen Hawking, interview with Daily Telegraph, 2001
"Let me end with an explanation of why I believe the move into space to
be a human imperative. It seems to me obvious in too many ways to need
listing that we cannot much longer depend upon our planet's relatively
fragile ecosystem to handle the realities of the human tomorrow. Unless we
turn human growth and energy toward the challenges and promises of space,
our only other choice may be the awful risk, currently demonstrable, of
stumbling into a cycle of fratricide and regression which could end all
chances of our evolving further or of even surviving."
Gene
Roddenberry, Planetary Report Vol. 1, 1981
"The Earth is just too small and fragile a basket for the human race to
keep all its eggs in."
Robert Heinlein, speech
"Today the human race is a single twig on the tree of life, a single
species on a single planet. Our condition can thus only be described as
extremely fragile, endangered by forces of nature currently beyond our
control, our own mistakes, and other branches of the wildly blossoming tree
itself. Looked at this way, we can then pose the question of the future of
humanity on Earth, in the solar system, and in the galaxy from the
standpoint of both evolutionary biology and human nature. The conclusion is
straightforward: Our choice is to grow, branch, spread and develop, or
stagnate and die."
Robert Zubrin, Entering Space, 1999
"The question to ask is whether the risk of traveling to space is worth
the benefit. The answer is an unequivocal yes, but not only for the reasons
that are usually touted by the space community: the need to explore, the
scientific return, and the possibility of commercial profit. The most
compelling reason, a very long-term one, is the necessity of using space to
protect Earth and guarantee the survival of humanity."
William
E. Burrows, The Wall Street Journal, 2003
"In time, [a Martian] colony would grow to the point of being self-
sustaining. When this stage was reached, humanity would have a precious
insurance policy against catastrophe at home. During the next millennium
there is a significant chance that civilization on Earth will be destroyed
by an asteroid, a killer plague or a global war. A Martian colony could keep
the flame of civilization and culture alive until Earth could be reverse-
colonized from Mars."
Paul Davies, The New York Times,
2004
"We must turn our guns away from each other and outwards, to defend the Earth,
creating a global and in space network of sensors and telescopes to find asteroids
that could destroy our planet and create the systems to stop them. It makes no
sense to dream great dreams while waiting to be hit by a train."
Buzz Aldrin and Rick Tumlinson, Ad Astra Online, 2006
"There are so many benefits to be derived from space exploration and
exploitation; why not take what seems to me the only chance of escaping what
is otherwise the sure destruction of all that humanity has struggled to
achieve for 50,000 years?"
Isaac Asimov, speech at Rutgers University
"Knowing what we know now, we are being irresponsible in our failure to
make the scientific and technical progress we will need for protecting our
newly discovered severely threatened and probably endangered species--us.
NASA is not about the 'Adventure of Human Space Exploration,' we are in the
deadly serious business of saving the species. All Human Exploration's
bottom line is about preserving our species over the long haul."
Astronaut
John Young,"The Big Picture"
"Space travel leading to skylife is vital to human survival, because the
question is not whether we will be hit by an asteroid, but when. A planetary
culture that does not develop spacefaring is courting suicide. All our history,
all our social progress and growing insight will be for nothing if we perish.
No risk of this kind, however small it might be argued to be, is worth taking,
and no cost to prevent it is too great. No level of risk is acceptable when
it comes to all or nothing survival."
Gregory Benford and George Zebrowski,
Skylife, 2000
"The dinosaurs became extinct because they didn't have a space program.
And if we become extinct because we don't have a space program, it'll serve
us right!"
Larry Niven, quoted by Arthur Clarke in interview
at space.com,
2001
"Colonization means potential immortality for the human genus. Man's
safety on Earth was never great, and it dwindles hourly. Disarmament, even
world government, will not guarantee survival in an age when population
presses natural resources to the limit and when the knowledge of how to work
mischief on a planetary scale is ever more widely diffused among peoples who
may grow ever more desperate."
Poul Anderson, Is There Life on Other
Worlds?, 1963
"I would not see our candle blown out in the wind. It is a small thing,
this dear gift of life handed us mysteriously out of immensity. I would not
have that gift expire... If I seem to be beating a dead horse again and
again, I must protest: No! I am beating, again and again, living man to keep
him awake and move his limbs and jump his mind... What's the use of looking
at Mars through a telescope, sitting on panels, writing books, if it isn't
to guarantee, not just the survival of mankind, but mankind surviving
forever!"
Ray Bradbury, Mars and the Mind of Man, 1971
"If the human species, or indeed any part of the biosphere, is to
continue to survive, it must eventually leave the Earth and colonize space.
For the simple fact of the matter is, the planet Earth is doomed... Let us
follow many environmentalists and regard the Earth as Gaia, the
mother of all life (which indeed she is). Gaia, like all mothers, is not
immortal. She is going to die. But her line of descent might be
immortal... Gaia's children might never die out--provided they move into
space. The Earth should be regarded as the womb of life--but one cannot
remain in the womb forever."
Frank Tipler, The Physics of Immortality,
1994
"If humanity persists and endures, in time we will come face to face with
the evolution of our sun. In a few billion years its slow brightening will
speed up as it swells into a red giant. Earth will then be uninhabitable, as
will the inner regions of the Solar System. Yet there will be other more
clement stars to which our descendents may wish to migrate. Certainly a
society that has developed space flight and space colonization will have the
advantage of never thereafter having to stand hostage to fortune."
T. A.
Heppenheimer, Toward Distant Suns, 1979
"If [the earth] goes, we go. And so we should go elsewhere, so that when the
earth goes, we have another place to go. And while we're at it, we should take
our pets and plants, too. We wouldn't want to be without them, just as they wouldn't
want to be without us--even if they don't know it. It's our job to know things,
and to act accordingly. And if we fail at that mission, then we really will have
failed in upholding our end of the Burkean bargain--that is, partnering not only
with the living and the dead, but with those who are yet to be born."
James Pinkerton,
"The Ultimate Lifeboat," TCS Daily, 2006
"In the long run, a single-planet species will not survive. One day, I don't know
when, but one day, there will be more humans living off the Earth than on it."
NASA director
Mike Griffin, quoted in "Mars or Bust,"
Rolling Stone, 2006
"Remember this: once the human race is established on more than one
planet and especially, in more than one solar system, there is no way
now imaginable to kill off the human race."
Robert Heinlein, speech at World
Science Fiction
Convention, 1961