01:750:109 Chapter Notes - Chapter 1: Milky Way, Observable Universe, Ecliptic
7 Jul 2016
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The average distance between earth and the sun, about 150 million kilometers. (au) Distance that light travels in one year; about 9. 46 trillion kilometers. (ly) A large glowing ball of gas that generates heat and light through nuclear fusion in its core. A moderately large object that orbits a star and shines primarily by reflecting light from its star. Orbits the sun; sphere shape; has not cleared the region of its orbit; not a moon. A relatively small and rocky object that orbits a star. A relatively small ice-rich object that orbits a star. An asteroid, comet, or other object that orbits a star but is too small to qualify as a planet or dwarf planet. The sun, and all the material that orbits it. A star (sometimes more than one star) and any planets and other materials that orbit it. A large assemblage of stars; a typical one contains millions to hundreds of billions of stars.
