PHYS 190 Lecture Notes - Lecture 22: Dark Matter, Nucleosynthesis, Vacuum Energy
4 Apr 2018
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1st stars very massive & die quickly. We find dark matter web, echoing the cmb. 2mass survey: 2 micron (i. e. infrared) all sky survey. 1. 6 million galaxies, blue closest, red furthest (about 1 billion light years) Simulations starting w/ measured cmb anisotropy show that primordial ripples in matter density would turn into today"s galaxy networks . But only if matter is mostly dark & cold (i. e. slow moving) Dark matter needs to be cold b/c needs to stay in place while aiding in formation of galaxies. Carl sagan - these are some of the things that hydrogen atoms do, given 15 billion years of cosmic evolution. It has the sound of epic myth, but it is simply a description of the evolution of the cosmos as revealed by science in our time . Big bang: top 4 reasons to buy it* Analogy - objects thrown up from earth"s surface.
