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[ Music ]

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>> Professor Stephen Hawking
is arguably our greatest

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living cosmologist.

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Struck down in his 20's

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by a progressive
motor neuron disease,

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he's entirely paralyzed, and
can only communicate using a

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speech synthesizer.

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But when Professor Hawking
speaks, NASA listens.

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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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We need a plan B.
If our species is

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to survive the next 100
years, let alone 1,000,

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it is imperative we voyage out
into the blackness of space

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to colonize new worlds
across the cosmos.

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The ISS is pioneering
space exploration.

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Without this knowledge, travel
into deep space is impossible.

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Within 50 years, I have no
doubt there will be settlements

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on the moon, and by
the end of the century,

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I truly hope humans
will be living on Mars.

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I think the work on the ISS
will take a new generation

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of human space explorers