Cosmic microwave background cmb radiation why is the

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Unformatted text preview: e have discussed (Cepheid variables and Type Ia supernovae), how do they allow us to determine distances? Why can’t we just use parallax to determine distances to galaxies? Big Bang: What are the four “pillars” of the Big Bang theory; i.e., four major lines of evidence? Expansion of the Universe: Hubble’s Law, galaxy redshifts Evidence for dark matter: galaxy speeds in clusters, hot gas in clusters, rotation curves, gravitational lensing, the Bullet Cluster Olber’s paradox: why isn’t the universe infinitely bright? Cosmic Microwave Background (CMB) radiation: why is the CMB evidence for the Big Bang? What does its spectrum look like? (Blackbody) What happened when the universe was 300,000 years old that caused the CMB to “decouple” from the rest of the universe (i.e. become transparent)? Big Bang nucleosynthesis: why did it begin after 3 minutes, and why did it stop? What elements were synthesized in the early universe? Galaxies: spiral vs. elliptical galaxies. Why do elliptical gal...
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