Black Holes Explained: What Is a Black Hole? How They Form in Space?

0:00 Predicting black holes mathematically (Jon Michell, 1780s) 0:40 Stellar birth: hydrogen gas collapse and nuclear fusion 1:07 E=mc² — how mass converts to energy in stars 1:37 Stellar death: running out of fuel, iron core collapse 2:05 White dwarfs — Chandrasekhar's electron repulsion limit 2:29 Neutron stars — surviving via neutron-proton repulsion 3:01 Beyond neutron stars: what if a star is even denser? 3:19 Singularity — Hawking & Penrose's infinite density point 3:36 Event horizon — the boundary light cannot escape 3:51 Black holes don't suck like vacuum cleaners 4:08 Finding a "black cat in a dark room" — detecting black holes 4:21 Cygnus X-1: X-ray evidence for a black hole 5:02 Hawking's speculation: more black holes than visible stars 5:41 Hawking radiation: black holes slowly evaporate 6:04 Singularities and the Theory of Everything