ASTR 100 Lecture : Astronomy Lecture 40
3 Apr 2014
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Document Summary
Cosmological part ii models curved space and the cosmic background radiation: cosmological models, 99% of all astronomers accept the big bang model, but his was not always the case, history of alternate models, einstein"s static with space curvature 1915, talked to people around him and concluded that space can be curved and just not changing, reasonable before knowledge of galaxies running away came about, de sittter"s empty but expanding model 1919, big bang model proposed in 1927 by le maitre. It can have any mass (open, euclidean, closed) but the radius is changing: steady state model proposed in 1948 by hoyle, curvature of space dark matter, mean density of the universe reveals the curvature, but there is lots of, these days astronomers study the cosmic microwave background (cmb) radiation to measure the curvature, we live in an expanding by euclidean universe, cosmic background radiation, cosmology changed profoundly in 1965 with its discovery by penzias &
