介绍:
I now turn to the second big question: Are we alone, or is there other life in the universe? We believe that life arose spontaneously on the Earth, so it must be possible for life to appear on other suitable planets, of which there seem to be a large number in the Galaxy. If we want to continue beyond the next hundred years, our future is in space. That’s why I’m in favor of manned - or should I say, personned - space flight.
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