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He believes marks of alien life may even be found here on Earth.

他认为在地球上甚至可能会发现外星生命的痕迹。

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which reviews the search for alien life and suggests ways to broaden the quest.

VOA: standard.2010.04.16

In it, he claimed that intelligent alien life almost certainly exists and that the search for it is valuable.

CNN: Should we fear space aliens?

That is unless we do ever contact alien life that is comprehensible.

BBC: How sci-fi moves with the times

Down the years most of our images of alien life have come not from the world of science but from the field of entertainment.

BBC: NEWS | UK | Magazine | Meet the neighbours