PHYS 1201 Lecture Notes - Lecture 1: Planetary Nebula, Interstellar Cloud, Gravitational Collapse
Document Summary
Properties: patterns of motion: large bodies orbit in same direction, object type: rocky, gaseous, icy, smaller bodies: asteroids & comets, anomalies: uranus"s tilt, venus"s flip, moon. Nebular theory: giant interstellar cloud (solar nebula) undergoes gravitational collapse formed everything. Close encounter theory: sun had a near-miss with another start and ejected debris that became planets. Galactic recycling: our system is from older dead stars. We see star formation occurring in interstellar nebulas. Collapse of a cloud: nebula has a small (non-zero) rotation, collapse speeds up rotation. Conservation of angular motion (like a figure skater spinning: collisions reduce the up/down motion and cause the cloud to, we see this (disk) around other stars flatten into a disk. Galactic recycling: responsible for all the heavy elements (hydrogen & We see star formation in interstellar gas clouds. Gravitational collapse of a cloud leads to rotational disk. We see disk around newly formed stars. Hotter closer to the middle of the disk.
