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Astronomy Week 7 Notes

by: Jenna Notetaker

Astronomy Week 7 Notes ASTR 1000-002

Jenna Notetaker

GPA 4.0

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About this Document

solar system formation
The Solar System (Lecture)
Charles Danforth
Class Notes
25 ?




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This 2 page Class Notes was uploaded by Jenna Notetaker on Thursday October 6, 2016. The Class Notes belongs to ASTR 1000-002 at University of Colorado at Boulder taught by Charles Danforth in Fall 2016. Since its upload, it has received 4 views. For similar materials see The Solar System (Lecture) in Astronomy and Physics at University of Colorado at Boulder.

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Date Created: 10/06/16
Astronomy Week 7 From a gas to larger solid objects is how a solar system forms  Growth of planets  Condensation Accretion Differentiation Absolute zero­ the lowest possible temperature, particles have no kinetic energy  The other (2% of the universe): hydrogen compounds (ices) 1.4 %, rock 0.4%, metal 0.2% Low temperature and higher density­ materials start to condense (called planet seeds when  dealing with planets) Frost line­ when water can condense  Accretion­ small objects gather together to make smaller objects  Densities  3 Water ice= 0.94 g/cm Water liquids= 1 g/cm 3 3 Rock= 2.7 to 3.7 g/cm Iron= 7.8 g/cm 3 Density= mass/volume Differentiation­ denser material sinks while lighter material floats Terrestrial planets: crust, mantel, and core Outside the frost line there is also ice Planets outside the frost line have three times more “stuff” to work with so they are able to get  much bigger There is lots of gas and planetesimals left after the planets begun to form  The young star emits solar winds and push the gas out of the nebula which stops the gas capture  of the planets  Small bodies moved into the Oort cloud, asteroid belt, and the Kuiper belt  Rocky planetesimals= asteroids  Icey planetesimals= comets Exceptions to the rules: Venus rotates backwards, Uranus and Pluto rotate sideways, the early  solar system was a very chaotic and dangerous place  Planets may have captured asteroids to make moons for themselves Comets brought water to Earth 


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