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Tolbert1 - Astronomy January 16, 2008 Lecture 1 Sun most...

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Astronomy January 16, 2008 Lecture 1 Sun most important object in the sky (for us). o Closest star to us. o Not terribly bright as stars go, but since it is so close to us, it is the brightest thing in our sky. Blots out all the other stars during the day. o Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, (Pluto) all in orbit around the sun. o Planet- objects that gravitationally orbit their star directly. Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, all have moons that orbit them. o Early people saw the earth as something entirely different than a planet. o Names of the week- named after Sun, Mercury, Venus, moon, Jupiter, Saturn. Out past Neptune, we have found a large number of other objects larger than Pluto. Decided to remove Pluto in the list of planets. It is now a dwarf planet. o Between Mars and Jupiter, asteroid belt. There is a dwarf planet there as well. o
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This note was uploaded on 04/20/2008 for the course ASTR 124 taught by Professor Tolbert during the Spring '08 term at UVA.

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Tolbert1 - Astronomy January 16, 2008 Lecture 1 Sun most...

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