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 Astronomy and Cosmology
 Astronomy and Cosmology


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Astronomy and Cosmology
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     Ever see "Back to the Future"? Well, I have and it really made me think. Could we travel back through time? Would it be a two-way trip? BTTFHere's what I have to say... At first I thought, no way, time travel can't be achieved! But when I really think about it, why not? Let's talk about Einstein. Space and time co-exist. Giant gravitational forces (such as stars) cause "dents" in this space-time fabric. Could we possibly "jump" over these dents? In the future maybe, but for now we have to think realistic. If you don't know already, if you travel even close to the speed of light, time starts to slow down. Back on Earth though time goes at normal speed therefore the people on Earth will age faster since time is going faster for them. That's one way you could get to the future faster.

     What about going back in time? You'd need a giant ferris wheel o' time travel. It would of course have to spin at the speed of light and it would have to have tremendous mass! You could in theory beat the light to where it was heading and again in theory arrive back in time by beating the light to it's intended destination.

     Here's where I try to explain complicated things. Hold on. Two-way time travel is going to a point in time and then returning to the point you came from. Such a journey is said to open a closed timelike loop (CTL). The problem with this is, if you go back in time and cause the (accidental, inadvertently, whatever) death of your maternal grandmother before you mom was born you would have therefore never been born and never made the trip. So the journey never happened and granny didn't die after all. In which case the time traveler HAS been born...and so on. Causality is a hypothetical law that says causes always precede effects. That theory does give us reason to believe we can open a CTL.

     When an electron/positron pair is made out of gamma radiation, the positron may annihilate with a different electron, leaving it's original partner free. Feynman pointed out that this is exactly equivalent to a single electron bouncing off a gamma ray and traveling backward in time before bouncing off a second gamma ray and continuing it's path into the future. Got it?

     Many geniuses, in my opinion, have come up with their theories of two-way time travel. From tipping light cones to my rotating cylinder theory, it is complex! Thanks to John Gibbin's book, "Unveiling the Edge of Time", I better understand these ideas and it's the source of my information.
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