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Lecture 13 - ASTR100Lecture13 13:55:00 Review...

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ASTR 100 Lecture 13 24/02/2009 13:55:00 Review     Comparative planetology how do we explain this information about Jovians and terrestrials?  -Later: debris (like Pluto)  Core Message: Planets are products of the environment in which they form -Most particularly the temperature of the environment (farther from the sun is  colder)  More data: Abundance of the elements, hydrogen, helium, etc. (the periodic table) (We know  this because of spectroscopy)  2 aspects: 1. Universe as a whole 2. Solar system  A. Universe as a whole Hydrogen 75%, helium 24%, 1% other  B. Solar System 71% hydrogen,  27% Helium, 2% other 
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Comment:     1. Why this mix? A. will be addressed in the last part of the course (Big bang) B.  addressed in the next part of the course Stellar physics (stars) Take B as given 2. Proportions/abundances in A) B) are by mass Solar system Hydrogen and Helium 71%, 27% (Jovians) Terrestrials are the 2%  oher By molecule 84%, 15% Why is this? Counting by mass and counting by number  are different, mass is more. Number less.  Why are jovians so much bigger tan terrestrials? 98% Hydrogen, helium in solar system  Follow up: how did the matter get distributed as it did? Major Theme 1:      Planetary Atmospheres What enables the planet to hold an atmosphere  What factors cause loss or growth of an atmosphere. Why is there an atmosphere on earth and not on the moon?
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  • Spring '07
  • Dappen
  • escape speed, hydrogen helium gases, Ex. Escape Speed, ATMOSPHERE Escape speed, hydrogen molecules    Earth

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