ASTR 152 Lecture Notes - Lecture 12: Big Bang, Protogalaxy, Electromagnetism

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28 Oct 2016
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Ei(cid:374)stei(cid:374)"s theor(cid:455) of ge(cid:374)eral relati(cid:448)it(cid:455) states that, just like the surfa(cid:272)e of a (cid:271)alloo(cid:374) (cid:449)ould in inflated, space itself is expanding. Open universe universe that will continue to expand forever (began with big bang and has no end) Closed universe universe will eventually stop its expansion and then start to collapse (began with big bang and will end with (cid:862)big cru(cid:374)(cid:272)h(cid:863)) Big bang, emmission of cosmic background radiation, dark ages, first stars, first supernovae and black holes, protogalaxy mergers, modern galaxies. Also tells us what the present temperature of the universe is (about 2. 73 k). Recombination an event (appx 1 mill years after the big bang) when t was. 3000 k, so p(+) and e(-) started combining to form h i atoms so the universe became transparent (from being opaque): the universe has the sa(cid:373)e t e(cid:448)er(cid:455)(cid:449)here, a(cid:374)d it is (cid:374)earl(cid:455) flat (cid:271)e(cid:272)ause of (cid:862)i(cid:374)flatio(cid:374)(cid:863)

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