NATS 1745 Study Guide - Heber Doust Curtis, Harlow Shapley, Spiral Galaxy
Document Summary
Nats1745 6. 0 history of astronomychapter 10 exam review. Interested in figuring out the organization of the universe. Used their great telescopes to catalogue over 5000 nebulae . They attempted to identify whether nebulae are distant star systems or nearby glowing gas clouds. He hoped to figure out whether nebulae are like all nearby gas clouds, which suggests our galaxy is the only galaxy in the universe or whether the nebulae are distant star systems beyond our galaxy. Variable star stars which fluctuate in brightness at regular time intervals. Luminous variable stars which pulsate rapidly @ intervals of days to weeks. Smc the brightest nebulae seen in the southern hemisphere. What did henrietta leavitt discover when she observed cepheids in the. She founds that the brighter the cepheid, the longer its period. If the cepheid is in another system then once you have the cepheid"s distance, you have the distance to another star system.
