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Originally Posted by Kesh
"Planetesimal" sounds like their made-up word for a planetoid impact (i.e. meteor, comet, etc.).
There actually is some danger of a "gamma ray burst" from the center of the galaxy, but it would literally take eons to reach us.
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"Planetesimal" is an actual astronomical term that refers to the the small bodies orbiting the star during the formation of a solar system. They become planets when they no longer accrete matter and reach their definitive size/orbit. The term was indeed misused.