Galaxies The Life and Death of the Stars. A galaxy is a cluster of stars, gas, and dust that are held together by gravity. There are three main types.
HR Diagrams
Stellar Evolution Where do gold earrings come from?
HR Diagrams AST 112. Measurements We can measure: – Temperature – Mass – Spectra – Size – Luminosity – Distance We can make measurements on trillions.
Let’s review some important things we want to know about stars…
Stellar Evolution
The Lives of Stars
