3. Alpha Centauri is the closest star system to Earth, at a distance of 4.37 light...

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3. Alpha Centauri is the closest star system to Earth, at a distance of 4.37 light years. Two astronauts, Alice and Bob, are both 19 years old. Alice travels to Alpha Centauri at 0.7c, quickly turns around, and returns to Earth at 0.7c. How old will Alice and Bob be when she gets back? 3. Alpha Centauri is the closest star system to Earth, at a distance of 4.37 light years. Two astronauts, Alice and Bob, are both 19 years old. Alice travels to Alpha Centauri at 0.7c, quickly turns around, and returns to Earth at 0.7c. How old will Alice and Bob be when she gets back?