ASTR 1010 Lecture Notes - Lecture 1: Dark Energy, Dark Matter
12 Aug 2016
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1st homework assignment posted on lon-capa (due: wednesday before class) There was a computer programming bug in the grading of a problem on the earth"s motion, but it has been fixed. Monday"s lecture planets, stars, galaxies, etc. and how they are distributed in the universe. Wednesday"s lecture how the planets, stars, galaxies, etc. move and why (i. e. gravity and the expansion of the universe) Today"s lecture the history of the universe. Big bang occurred approximately 14 billion years ago: we know it happened because the universe is expanding. As it expanded, it became cooler and less dense. Before galaxies, stars, etc. , there were just lumps . Lumps had lumps which contained lumps, so on. Universe was denser than sun in the beginning. Material in the universe is not evenly spaced out. Gravity drew regions (lumps) into galaxies, etc. e r s e n iv.
