A black hole forms when mass is compressed so tightly that not even light escapes. The boundary is the event horizon at r_S = 2GM/c². Despite this, black holes slowly radiate: Hawking temperature T = ℏc³/(8πGMk_B) — inversely proportional to mass. The Sun as a black hole: T = 60 nanokelvin, evaporation time 2·10⁶⁷ years. A 10¹¹-kg micro black hole from the Big Bang would evaporate now — a dark matter candidate. Verified: accretion disk Doppler coloring, Hawking luminosity formula.
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