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    Interstellar Travel

    just googled solar sail and discovered that solar wind is just super heated particles flying away from the sun at 400 kmps, how would we produce these with a laser? It doesn't look to me like solar wind has anything to do with light, oh and at 400 kmps it would take 3012 years to get there.
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    Interstellar Travel

    will somebody please explain to me what excatly solar wind is? And how it could be produced with a laser? Light has no matter, it is just electromagnetism right, thats why it can travel at C. Mmmkaayyyy so if light has no mass then it can have no inertia right? And with no inertia how can it...
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    Interstellar Travel

    How long will it be before we reach alpha centauri, i was on a thread on Fark.com yesterday about going to mars and it interstellar travel came up. I figured you guys (and girls) would prob have a better idea on what ideas are out there right now. this was my post: do you know how impossibly...
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    The size of the universe

    How big is the universe? This has been really bugging me since I read an article that said it was 30 billion light years across. This, however, did not seem possible to me, if the universe is about 8 billion years old, then isn't the maximum size the universe could be 16 billion light years...
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