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swampwiz
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I had read in the Time-Life Science Library book "Man And Space" about the possibility of a very, very ambitious mission in which an astronaut would go to a galaxy 200 million light-years away, with the spacecraft simply being accelerated at 1 g during the whole time (in the direction of the galaxy for half of a leg, then in the other direction for the other half), and thus going for the most part at nearly the speed of light as observed from the Milky Way, with the net effect that the astronaut would experience about 26 years of time pass by for each leg. This astronaut would start his trip by observing that galaxy as being 200 million light-years away, but then reach the galaxy in only 26 years, thus he would conclude that the galaxy appears to be moving at about 8 times the speed of light. What gives?
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