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Ancient Earth Light

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4 comments to Ancient Earth Light

  • When I read about the improbability of time travel, I always curse Hawking for his chronology protection conjecture.

    Then again, I don’t think he ever thought of installing a Brown Industries Flux Capacitor(tm) in a modified 1982 DeLorean DMC-12. You see the stainless steel construction makes the flux dispersal…. oh, my god, they found me. I don’t know how but they found me.

  • klox

    Or we might be able to expand space behind us faster than the speed of light (like how the universe is expanding). I mean, it’s only 2000 light years away! Detecting it would definitely be tough since the light reflecting off of a person isn’t like a star radiating. There is a non trivial difference in power there.

  • puffoflogic

    I believe Superboy used this trick a number of times in the 60′s–flying into space, overtaking old light rays, and then observing the past. Of course, his super-vision was capable of seeing events happening on far-distant worlds in real time, so his comic-book physics were a little bit muddled.

  • nowoo

    Most of the stars we see at night (without binoculars or a telescope) are tens, hundreds, or maybe thousands of light years away, but not millions (except for the barely visible Andromeda Galaxy at ~2.5 million light years), so we aren’t seeing them as they were millions of years ago. I think a lot of people confuse the huge numbers used when talking about stellar distances in km, like the almost 10 trillion km to the nearest star (other than the Sun) and they assume the numbers are similarly huge when talking about distances in light years and therefore also the age of that light. If my calculations are correct, the light from Alpha Centauri is only about as old as SGU Ep. 65, and a mirror positioned there would currently let us see a reflection today of Earth as it appeared in mid-2002.

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