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9/29 Notes

by: Lindsey Kangas

9/29 Notes 10273

Lindsey Kangas
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About this Document

Topics we discussed in class that day.
Intro Astronomy: Earth&Planets
Dr. Ingram
Class Notes




Popular in Intro Astronomy: Earth&Planets

Popular in PHYSICS (PHY)

This 1 page Class Notes was uploaded by Lindsey Kangas on Thursday September 29, 2016. The Class Notes belongs to 10273 at Texas Christian University taught by Dr. Ingram in Fall 2016. Since its upload, it has received 4 views. For similar materials see Intro Astronomy: Earth&Planets in PHYSICS (PHY) at Texas Christian University.


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Date Created: 09/29/16
Notes 9/28 Properties of the Solar System 1. There are 2 types of planets: a. Four terrestrial (rocky) b. Four Jovian (gas) 2. Orbits are coplanar, nearly circular, and in the same direction 3. Planets have a different composition from the sun (volatiles) a. Volatiles are substances easily destroyed by heat Catastrophe Hypothesis  The sun formed by itself and then had a collision/close encounter with another star; the resulting debris created planets  Not correct because: o Space is big and collision are rare (Maybe it was a fluke? Still not possible because most stars like ours have Earth-like planets.) o Planets are made with different substances, including volatiles  We believed because: o We did not know the size of the galaxy o We though stars were closer together o We did not know the composition of the sun (we first believed the sun and earth were made of the same stuff; i.e. dirt, iron, magnesium) Capture Hypothesis  The sun formed by itself and captured passing planets  Not correct because: o Space is too big; encounters are too rare o Orbits would be random or even backwards  Oriented in all different planes; more elliptical o Capture is too difficult, physically.  Escape velocity  As the planet falls in toward the sun, it would achieve escape velocity (pick up too much speed) and move past the sun  Something would have to slow the planets down/constantly be hitting the breaks (planets can’t do this on their own)  We believed because: o We thought the galaxy was smaller o We though space was filled with “aether” (now we know space is totally empty) Solar Nebular (current/correct theory)  Planets form out of the same cloud of gas and dust as the sun; simultaneously


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