ASTR 340 Lecture Notes - Lecture 11: Hawking Radiation, Accretion Disk, Solar Mass
Document Summary
If larger than, object will fall back to earth. If less than, object never returns to earth. Black holes are objects with mass so large or gravity so large that even light cannot escape (john. 1915-1916: general theory of relativity published by einstein. Event horizon: point of no return, where escape velocity is equal to the speed of light. Nothing beyond eh can be seen by outside observer. As object nears black hole, its light cone (causality) gets deformed and pulled in towards black hole. 1920"s-1930"s: work on collapsing stars leads to debates about black holes. 1960"s: golden age of gr; black hole name coined. 1970: discovery of first good candidate for a black hole. 2000: evidence that most massive galaxies host massive black holes at centers (hubble) Singularity: the center, where all matter is concentrated. Objects close to black hole are dragged into rotation with it.
