Astronomy 2022A/B Study Guide - Final Guide: Cosmic Distance Ladder, Special Relativity, Redshift

• School: Western University
• Department: Astronomy
• Course: Astronomy 2022A/B
• Professor: Pauline Barmby

Document Summary

Astronomy 2022a- midterm: scale of the universe (chapters 2,12) Galaxy- massive system with million of billions of stars, together with gas and dust, help together by gravitational attraction. Star- a huge ball of gas help together by gravity. Planet- a central ball of gas help together by gravity. Universe- all of space-time, all matter, all energy, everything! Distance traveled by light ray over one year. Astronomical unit (au)- distance from the earth to the sun (150 million km) To multiply or divide, multiply or divide first part, then add or subtract exponents. Difference in the apparent position of an object viewed along two different lines of sight. Measures distances within the milky way galaxy. Star brightness varies in a periodic way. Goes from a maximum to a minimum. Brighter starts take longer to change states. Calculate distance by intrinsic brightness and measured brightness other cepheid stars. Know standard candle and measure distance comparative to.