The heavy elements needed to build a long-lasting planetary disk around a star weren't available until later supernova explosions created them, scientists thought. Related: James Webb telescope ...
Lots of things out in the universe can cause a supernova, from the gravitational collapse of a massive star, to the collision ...
The Big Bang produced hydrogen and helium. All the other elements have been produced by nuclear fusion reactions in stars and supernova explosions.
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