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These are the first emissaries of our human culture that an alien would decode. >> it takes so long for sound to get out there. and i would never think you would describe of us as living in an alien zoo. i think we have a little bit of time for a lightning round. true or false, saturn would float in water, true or false? >> yeah, the density of watsatu is less than water. >> you'd be the same height in space, true or false? >> you're an inch or two taller in space, the moment you come back, you shrink back. >> the face on the landscape of mars was evidence of life there? >> of course not. it w...

Right. we'll give ourselves a pass on that one. no one can hear you scream in space, true or false? >> that's true, unless you've got radio communication, there's no air. air propagates sound, so if you're in the vacuum of space and you scream, no one's listening. >> i should put my kids out there. there's a star made entirely of diamond. true or false? >> there are dead stars that are principally carbon and under very high pressure with enough time, the crystalline structure can change. they're not active stars sustaining life on surrounding planets. they're dead. you wouldn't want to be a pl...