NATS 1945 Lecture Notes - Lecture 3: Event Horizon, Escape Velocity, Cygnus X-1
31 Oct 2017
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The smaller and more massive the source of gravity, the larger vesc (vesc, earth = 11km/s) Black hole: an object for which vesc exceeds the speed of light (c = 300, 000km/s) If ev increases with density, when you have lots of mass compressed in a small amount of volume, then super dense objects, like a wds, or n sta(cid:396), (cid:449)ill ha(cid:448)e supe(cid:396) high ev"s. Wd has the mass of the sun packed into the size of the earth, giving it an ev of about. A ns which has the mass of a few suns packed into the size of just a few hundred km, has an ev of about 12, 000vesc, earth, times the value of earth. So, what would happen if we extrapolated the relationship between ev and density, until we get an ev that exceeds the speed of light. The speed of light is 300, 000km/s, we denote that as c, which is only about twice the.
