AST101H1 Study Guide - Final Guide: Milky Way, Virgo Supercluster, Local Group
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AST101H1 Full Course Notes
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Universe, local supercluster, local group, milky way galaxy, solar system, earth. Astronomical units (au): earth"s distance from the sun, approximately 150 million km. Light-year (ly): distance that light can travel in 1 year. Light takes 1 second to reach earth from the moon and 8 minutes to reach earth from the sun. Star: a large glowing ball of gas that generates heat and light through nuclear fusion as its core. Planet: moderately large object that orbits a star, large enough for its own gravity to make it into a round shape and has cleared most other objects from its path. Asteroid: relatively small and rocky object that orbits a star. Comet: small and icy object that orbits a star. Expansion: increase in average distance between galaxies as time progresses. Eris, pluto, neptune, uranus, saturn, jupiter, mars, earth, venus, mercury, the sun. Earth has a daily rotation spin and its yearly orbit around the sun.