Two rockets fly away from the Earth in opposite directions.  Each rocket is moving at a speed of v = 0.81 c as seen from the Earth.   a. How fast is rocket "B" moving as seen by the astronaut in rocket "A"?  Express your answer as a decimal fraction of the speed of light.   c b. If the astronaut on rocket "A" measures a time interval of 60 minutes, how much time would they say goes by for the astronaut on rocket "B"?  minutes c. Rocket "A" travels out from Earth at a speed of v = 0.81 c for a period of one year as measured on Earth, turns around, and then travels back to the Earth at the same speed for another Earth year.  How much did the astronaut on the rocket age?  years

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