Astronomers observe supernova explosion hit Earth with a gamma-ray burst

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These types of star explosions are extremely rare. Every hundred years or so a star in our Milky Way galaxy go supernova. But a supernova that leaves trackable gamma-ray burst, like GRB 221009A, explodes only every million years in a medium-sized galaxy like ours,  Cendes explains.

After the supernova explosion, a black hole appears.  According to NASA “Most black holes form from the remnants of a large star that dies in a supernova explosion.” 

A star dies. A supernova rises. And a black hole is born.