ASTR 101 Lecture Notes - Lecture 34: Star Formation
Document Summary
Planets caught gravitationally by the sun after all were formed. Doesn"t work bc planets would be in random orbits if captured. A near miss between the sun and another star. That pulled a bunch of gas off of the sun. Gas condensed out into a disk that formed the planets. Doesn"t work bc gas would have dissipated and wouldn"t be able to form into stars. Also the odds of a tidal encounter are incredibly small. The material falling into the sun as the sun formed turned into a disk. Would have to explain orbits are same plane, same direction, circular. And differences in planets mass composition and inner vs outer. Space is not empty because of interstellar matter (interstellar medium) Dark clouds-dust clouds where stars form from dust. Collapses bc gravity inward balanced with pressure outward until. Star formation seen in many places something comes along to compress it (like a shockwave from a supernova).
