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vonboysp said:

about the stars blowing up like fireworks, matt groaning has said that he tries to follow physics most of the time, but he'll fudge up some things if there comedic value in it.

oh well yeah I'm sure he knows that they don't and just wanted to do that for the cartoon.  He knew so much about the rest of how the Universe is likely to die that it would be unreasonable to expect he doesn't know about how stars collapse.