GSC 102 Lecture Notes - Lecture 2: Phanerozoic, Punctuated Equilibrium, Ringwoodite
13 Apr 2017
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Cepheid stars pulse with a frequency which is proportional to their luminosity. 1 light year = 5. 9 trillion miles. We use parallax to determine the distance to (relatively) nearby objects. There are plenty of fuzzy, gassy, diffuse nebulae in the galaxy. Andromeda galaxy is about the most distant thing you can see with the naked eye. Doppler effect is when a wave emitted or received by a moving object appears to change. Noises from things moving towards us get higher in pitch, and from things moving away from us get lower. Light from things moving towards us gets bluer, and from things moving away from us gets redder. Hubble"s law observes that more distant galaxies are moving away from us more quickly. Hubble"s law implies that space is expanding. Anything with a temperature emits blackbody radiation. As something gets hotter, it emits wavelengths (or colors) of higher energy cosmic microwave background is essentially the temperature of the.
