Question

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how do stellar black holes form?
a they form when a star and a black hole orbit close together.

b they form when the center of a very massive star collapses in on itself.

c they form in the early universe after the big bang.

d they form at the same time as the galaxy they are in.

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Explanation:

Stellar black holes originate from the death of very massive stars. When such a star exhausts its nuclear fuel, its core can no longer support the star's own weight, causing the core to collapse inward under gravity, forming a stellar black hole. Option A describes a binary system interaction not related to stellar black hole formation. Option C refers to primordial black holes, and Option D is incorrect as stellar black holes form long after their host galaxy begins to exist.

Answer:

B. They form when the center of a very massive star collapses in on itself.