GALACTIC UNIVERSE. What is a Galaxy?. It is a group of billions and billions of stars held together by gravity. Spiral Galaxy. Bulge. Disk. Side View. Top View. Huge; contains stars, gas, and dust Held together by gravity Pinwheel shape/looks like a hurricane Bulge and thin disk
It is a group of billions and billions of stars held together by gravity.
Stellar Nebula (where stars are born)
(death of a star)