Astr 102 test - Study guides, Class notes & Summaries

globular clusters - older stars; all of the stars formed at the same time, but evolve differently depending on their mass How can globular clusters help find distances? - they contain standard candles like Cepheid variables How far away is the center of the Milky Way? - about 27,000 light years from the sun Where is the sun located in the Milky Way? - about half way between the center and the outer edge What does the center of the Milky Way have to do with globular cluster? - globular clu...

What 2 observations tell us the universe is expanding? - Galaxies are moving away from us and their speeds are proportional to distance How does an objects red or blueshift relate to the object's movement? - Blueshift is when an object is moving towards you. Redshift is when an object moves away from you How does a galaxy's speed relate to its distance? - The further away it is the faster it will move Does the universe have a center? - No