AST 111 Chapter Notes - Chapter 5: Vesto Slipher, Mount Wilson Observatory, Edwin Hubble
6 Jun 2020
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If it was moving towards us, we would see a blueshift. Redshift of galaxies were first measured by vesto slipher. First measured the doppler shift of m31, the andromeda galaxy. But observations of a number of other galaxies showed that most had redshifts. They were moving way from us at speeds of 100s of km/s. Edwin hubble then measured the distance of these galaxies. Hubble worked at mount wilson observatory, and was able to use the new 100 inch telescope. Edwin hubble discovered that recession speed (measured by red shift of their spectral lines) increased with distance (hubble"s law) Redshift of galaxies is key evidence of the big bang theory. Space expands and carried galaxies with it. Initial fireball first chemical elements formed here. The big bang space, time and matter created. Evidence for the big bang initial fireball. Cosmic microwave background is the red shifted glow of the big bang explosion.
