PCS 581 Midterm: PCS 581 Midterm 1
Document Summary
Can"t see past 13. 7 as light hasn"t had time to reach any further the rest of the universe is considered outside of the observable universe. It is moving away from us, and faster over time. Most planets are red shifted: indicating they are moving away from us. Space is expanding, everything is moving away from everything else as it expands. Big band occurred everywhere in space at the same time. Can calculate backwards within 1/10 billionth of a second of the big band. Note: in a small scale strong and weak forces win out to large forces due to the strong binds atomic nuclei have. Strong force: binds the nucleus, strongest force. Electromagnetism: bind atoms, much stronger than gravity, second strongest force. Gravitational force: binds the solar system, weakest force. Within 10^-36 pieces of the universe went from atomic nucleus size to the size of the solar system. The expansion was faster then the speed of light.
