ASTRON 2B03 Lecture Notes - Lecture 25: Cygnus X-1, Redshift, Strong Gravity
2 Dec 2016
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Document Summary
Stars: gravity vs pressure (type of pressure differs) Normal star - gravity balanced by pressure from nuclear fusion. White dwarf - gravity balanced by pressure since you can"t pack c/o atoms any tighter source of pressure comes to how tightly you can pack these together, which limit size of white dwarf. Neutron star - gravity balanced by pressure since you can"t pack neutrons any tigher. Black hole - gravity wins over (not balanced) Fusion in stars produce elements up to iron heavier elements can only be produced with added energy -> supernova. Solar system has elements like gold from interstellar medium (ism) material by supernova. M = d v high d = large g force (assuming you"re close to the object) De"f of bh: has escape velocity that"s so high that even light can"t escape. Escape velocity numbers: high escape velocity = more spacetime curvature.
