Answered: The star Alpha Centauri is about 4… | bartleby

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21. The star Alpha Centauri is about 4 light-years away
from us. Suppose that in our mutual reference
frame an Earth comedian named Rebo tells a joke
and a week later an alien at Alpha Centauri laughs.
(a) How fast would a rocket have to be moving in
order for its reference frame to conclude that
the laugh happened at the same time as the
joke?
(b) Is it possible that the joke caused the alien to
laugh? How do you know?

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