Quote:
Originally Posted by WT Sharpe
Great video.
We know that astronauts in our day have already traveled through time. Only microseconds, to be sure, but the time dilation experienced by lunar astronauts away from the earth's gravitational field (which also causes distortions of time), and the distance into the future they have traveled, is measurable.
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In the case of the Apollo astronauts, there were two competing factors at work.
1. The speed of their travel would cause a small amount of time dilation, which would result in time passing a little more slowly for them than for people back on Earth.
2. They spent time in a slightly weaker gravitational field than people back on Earth did. This would result in time passing a little more quickly than it did back on Earth.
Of these, the time dilation effect would be by far the greater (although still very, very small).