ASTR 2010 Lecture 1: Astronomy week 2
Document Summary
Stars mass range from 0. 1 - 100 solar masses. Stronger gravity of a more massive star, drives up the rate of nuclear fusion. Matter from old stars is recycled to new stars. Stars are more crowded in the center. Supercluster : collections of many galaxy clusters. We can only see as far away as light has had time to travel in the age of the universe. Sun"s surface is about 700,000 km from its center. Photosphere: where the sun"s gas changes from opaque to transparent. Hydrostatic equilibrium: balance between pressure and gravity.
