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Tolbert1 - Astronomy August 26, 2008 Lecture 1 Solar system...

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Astronomy August 26, 2008 Lecture 1 Solar system consists of sun, and all objects gravitationally bound to the sun. o The sun itself is the closest star to us, and when it is above the horizon, we can’t see any of the other stars. Planets gravitationally orbit the sun. A year is the amount of time it takes a planet to orbit the sun. The moon orbits the earth, and is gravitationally connected to the earth. Moon orbits earth once a month, and that’s where we get the word month (moon). Closest to the sun is Mercury. Orbits the sun very rapidly, orbits around 88 Earth days. Named for the messenger god. Next is Venus, and is almost the same size of the Earth. Unfortunately, it has a large amount of CO2 in Venus, making it the hottest planet. Roughly 1,000 degrees Fahrenheit. Next is Earth, and following Earth is Mars. Closer to size with Mercury. o Has moons of its own- two moons. The first 4 planets are closest to the sun. Next, there is a big gap, leading to
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This note was uploaded on 10/16/2008 for the course ASTR 121 taught by Professor Tolbert during the Spring '08 term at UVA.

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Tolbert1 - Astronomy August 26, 2008 Lecture 1 Solar system...

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