PHYS133 Chapter Notes - Chapter 1: Ballpoint Pen, Outer Space, Virgo Supercluster
3 Mar 2016
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Moon (satellite) an object that orbits a planet. Asteroid a relatively small and rocky object that obits a star. Comet a relatively small and icy object that orbits a star. Star a large, glowing ball of gas that generates heal and light. Planet a moderately large object that obits a star; it shines by (cid:1) (cid:1) through nuclear fusion (cid:1) (cid:1) reflected light. Nebula an interstellar (space between the stars) cloud of gas and. Solar (star) system a star and all the material that orbits it, including. Galaxy a great island of (100 billion) stars in space, all held together. The physical universe the sum total of all matter and energy which is. Based on the observed rate of expansion, the universe is about 14. Inference: a beginning (big bang) billion years old. A satellite called wmap yielded results (2003 indicating the age is.
