According to Bob on Earth, Planet Y (uninhabited) is 5 ly away. Anna is in a spaceship moving away from Earth at 0.8c. She is bound for Planet Y to study its geology. Unfortunately, Planet Y explodes. According to Bob, this occurred 2 yr after Anna passed Earth. (Bob, of course, has to wait a while for the light from the explosion to arrive, but he reaches his conclusion by "working backward.") Call the passing of Anna and Bob time zero for both, (a) According to Anna, how far away is Planet Y when it explodes? (b) At what time does it explode?
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