Crash Course Astronomy | Black Holes: Crash Course Astronomy #33 | Episode 33 | PBS

By Owner - Crash Course Astronomy - Powered By PBSFrom Pbs OrgSeptember 6, 2025

Stellar mass black holes form when a very massive star dies, and its core collapses. Black holes come in different sizes, but for all of them, the escape velocity is greater than the speed of light, so nothing can escape, not matter or light.

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