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Originally Posted by 12clicks
incorrect. any time two objects head towards each other, they are closing the space between them faster than if only one of them is in motion, whether it be a light particle or a car.
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yes, as sound changes pitch when in motion, light changes colour to be either red for moving away or blue for moving towards the observer. By measuring the red shift or blue shift you can determine an objects speed.
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regardless of how fast you go, you will age at the same rate. this is the fallacy of the time travel theory.
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take a flight in a spaceship at 99.99% speed of light for 5 or so years and when you come back everyone you know WILL be dead or very old. I don't think youve debunked einstein just yet.
same reason they adjust the clocks on the gps satellites every day, because the clocks literally run at different speeds when closer to a strong gravity source or when travelling at near the speed of light.