How much time would pass on Earth if I traveled at the speed of light for a year?
How much time would pass on Earth if I traveled at the speed of light for a year? At 99.99 percent of the speed of light, a craft traveling for one year would come back to a world that had aged more than 70 years in their absence. At 99.99999 percent of the speed of light, for a year, more than 2000 years would pass on Earth.
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