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    Is Mass Relative?

    well it seems that you change in mass would be equal to your change in energy, potential or kinetic, then that divided by the speed of light squared plus your rest mass? Is there a mass that stays invariant no matter what reference frame you observe it from?
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    Is Mass Relative?

    So mass is not a set number at all then. If you were travelling next to an object at the same velocity, and you measured its mass, and then some how measured it while you were at rest and the object was still moving, their masses would differ?
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    Is Mass Relative?

    Ok this may or may not sound like a very stupid idea. But having read the Black Hole War by Leonard Susskind, he makes a claim that as the Earth gets closer and closer to the center, squeezed by gravity, it loses potential energy. The lost potential energy is then radiated as heat, and therefore...
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    Question on Black Holes

    Ok, that makes a lot of sense. Thank you for clearing that up!
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    Question on Black Holes

    Actually JesseM, that makes perfect sense to me now. I somewhat thought that may be it, but I understand now that the ever increasing redshift causes it to disappear to plain sight. Its really interesting how black holes work and its odd to think how many contradictions to everyday life occur...
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    Question on Black Holes

    But that doesn't make sense. If someone at a great distance never see's the particle cross at the event horizon, then it never disappears completely does it? so wouldn't the black hole illuminate, or at least be visible from all the particles that has fallen into it?
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    A problem with time travel.

    Hmmm, this is an interesting problem. Take into account a Minkowski diagram (the three spacial dimmensions on the X axis plotted as a funtion of time on the Y axis). If you move back into time, which would be moving down in a verticle line, you yourself stay in the same position it seems at a...
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    Question on Black Holes

    Well, I'm currently reading The Black Hole War by Leonard Susskind, and one thing to me seriously doesnt add up. It says that when someone falls into a black hole, and observer from the outside would not see them fall into the singularity, but they would seem to stretch out and move slower and...
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