The star alpha goes supernova ten years later and 80 ly


The star Alpha goes supernova. Ten years later and 80 ly away, as measured by astronomers in the galaxy, star Beta explodes.

An alien spacecraft passing through the galaxy finds that the distance between the two explosions is 150 ly. According to the aliens, what is the time between the explosions?

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Physics: The star alpha goes supernova ten years later and 80 ly
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