To travel between solar systems, a spacecraft would need extremely sophisticated – if not impossible – technology.
Barack Obama's insisting the USA doesn't have little green men or alien spaceships locked up in an underground bunker somewhere ... but, if they ever visit Earth, he's volunteering to lead the ...
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What should you do if you meet an alien? Neil deGrasse Tyson in 'Take Me To Your Leader' (interview)
In a world easily startled by sensationalism, Tyson offers a cool, gentle voice of reason amid the unchecked fascination with alien visitation.
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