# AST201H1 Midterm: Up to first midterm

**bhogalsim**and

**39543 others**unlocked

24

###### AST201H1 Full Course Notes

Verified Note

24 documents

## Document Summary

Lecture 2 readings (1, 3. 4, 3. 5: rotation: spin, orbit: revolution around the sun, astronomical unit (au): earth"s average orbital distance; 150 million km www. notesolution. com. Big bang radiation was the dominant mass in the universe; e=mc2 (energy released/absorbed=mass lost/gained x speed of light, squared) Lecture 4 gravity, light, electromagnetic waves and spectrum. Kepler"s first law: orbits are ellipses; with the sun at one focus and nothing at the other. Kepler"s second law: the are swept out in 30 day periods are all equal; as a result of angular momentum; his second law basically states that speed x radius= constant. Newton"s universal law of gravitation: every mass attracts every other mass; Center of mass: because of momentum conservation, orbiting objects orbit around their center of mass (therefore for two equal sized objects it will be in the middle, otherwise it will be closer to the larger object)