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>> Hi Professor Hawking.

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It's amazing to know you're
watching and thinking about us

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up here on the International
Space Station.

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We'd love to have you up here.

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Would traveling into
low-earth orbit interest you?

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>> [Computer voice] In
2007, I was lucky enough

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to experience microgravity
on a zero-G flight.

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For me, this was true freedom.

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People who know me well say

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that my smile was the
biggest they'd ever seen.

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I was Superman for
those few minutes.

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I can only imagine what it's
like for you, Rick and Koichi,

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to fly like Superman
for 6 months.

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If you can persuade the
Russians to let me on the Soyuz,

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I'd be up there with you before
you could say kryptonite.

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>> You've been quoted as
saying, humanity won't survive

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without escaping
our fragile planet.

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What are your primary concerns?

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>> [Computer voice] I
fear for our future.

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Our planet earth is threatened

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with an ever-expanding
population,

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and only finite resources.

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There is always a chance of
an asteroid hitting earth.

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Not even Bruce Willis
could save us then.

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We need to anticipate these
disasters and have a plan B.

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If our species is to survive,
it is imperative we voyage

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out into the blackness of
space with a determination