Astronomy 2021A/B Lecture 3: Chapter 3 Notes
9 Feb 2017
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The elements of life are widespread basic earth elements are everywhere. Same physical laws that operate on earth operate throughout the universe. 3. 2 structure, scale and history of the universe. Tar: a large glo(cid:449)i(cid:374)g (cid:271)all of gas that"s (cid:449)ar(cid:373) i. e. the su(cid:374) Planet: moderately large object that orbits a star, is large enough for its own gravity to make it round, and has cleared most objects from its orbital path. Extrasolar planet: a planet orbiting another star. Habitable planet: a planet with the conditions to let humans live. Moon (or satellite): an object that orbits a planet. Asteroid: small and rocky object that orbits a star. Comet: small and ice-rich object that orbits a star. Solar system: the sun and all the material that orbits it, including the planets. Star system: a star and any planets that orbit it. Galaxy: a shit load of space, and everything in it containing a bunch of stars held by gravity.
