ASTR 207 Lecture Notes - Lecture 1: Small Solar System Body, Kuiper Belt, Asteroid Belt
15 Nov 2015
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Document Summary
Milky way galaxy a huge, disk-shaped collection of stars we are apart of. The earths average distance from the sun, which is about 150 million km (93 million meters). One light-year (ly) is the distance light can travel in 1 year, about 10 trillion km (6 trill miles) A large, glowing ball of gas that generates heat and light through nuclear fusion in its core. A moderately large object that obrits a star and shines primarily by reflecting light from its star. Criteria 1) orbits star 2) large enough for its own gravity to make it round 3) has cleared objects out of its orbital path. A planet that is rounded by gravity, orbits a star but hasn"t cleared objects from its orbital path. Satellite is generally used to refer to an object orbiting another object. A relatively rocky and small object orbiting a star.
