A pair instability supernova occurs when the furnace of reactions in the heart of a star are no longer powerful enough to act against its massive gravity. Then the star collapses spectacularly, as seen here in an image of supernova remnant E0102-72.
the original suicide bomber?
in clumps of dark matter called dark matter haloes the basic building blocks of galaxies.
The existence of dark mater is still pretty controversial I believe.
Thanks Fred Nerks for posting
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