HISTORY 2720 Lecture Notes - Lecture 6: Gravitational Lens, Observable Universe, Vera Rubin
26 Mar 2018
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Document Summary
Everything was uniform and simple in the beginning, same temp and look. Complex things happen when you have perfect goldilocks conditions: Gravity - more powerful when stuff is closer/denser. Tiny differences in distribution of matter (1/1000000 of a degree difference in temperature) Gravity continued to bring these tiny differences closer together, causing heat and energy to be formed by the bumping atoms. Universe is cooling down, suddenly heating up for first time. Now we"re filled with stars that are still being born in star nurseries. Photons work through surrounding plasma to provide a light. At this scale, you can see the superclusters moving farther away from each other. Galaxy doesn"t hold these together - we"re expanding. These stars provide us with "campfires in antarctica" that have goldilocks conditions around them. Stars heating up cooked up the elements of the universe. Carbon has 6 protons so it needs more heat. Most of their life they are fusing hydrogen to helium.
