ASTRO-110 Study Guide - Quiz Guide: Nuclear Fusion, Milky Way, Star System
22 Sep 2020
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Star: a large, glowing ball of gas that generates heat and light through nuclear fusion in its core. If an object meets the first 2 it is considered a dwarf planet. Moon (or satellite): an object that orbits a planet. Asteroid: a relatively small and rocky object that orbits a star. Comet: a relatively small and ice rich object that orbits a star. Small solar system body: an asteroid, comet or another object that orbits a star but is too small to qualify as a planet or moon. Solar system: the sun and all the material that orbits it. Star system: a star and any planets and other materials that orbit it. Galaxy: a great island of stars in space containing up to trillions of stars, all held together by gravity and orbiting a common center. Cluster of galaxies: a collection of galaxies bound together by gravity.
