Astronomy 1011A/B Study Guide - Midterm Guide: Photosphere, Solar Mass, Gravitational Energy
1 Jun 2016
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Expansion cont. except where gravity has won stars, galaxies, clusters. Universe began with only the chemical elements h & he, stars have created the elements from which rocky planets are made. Made of rock, ice or gas (or some of each) Moon (satellite) an object that orbits a planet. Asteroids & comets: small objects orbiting a star. Universe: the sum total of all matter and energy. This is the absolute fastest speed possible in the universe! 300,000 km/s scale models: reduce sizes and distances by the same factor. Total solar eclipse: the apparent size of the sun and the moon are the same! So clearly the sun must be further away about 400 times in fact. Light year is a measure of distance, not time! Earth"s circumference is about 40,000 km and we rotate once in 24 hours. The earth rotates around its axis once every day.
