Asked by Sandra

Which process explains why the terrestrial planets do not have hydrogen and helium in their atmospheres?
thermal escape (??)
condensation
out gassing
solar wind

Answers

Answered by Damon
Yes, I would guess those light gasses would exceed escape velocity due to heat.
Answered by Sandra
Thanks much!!
Answered by Damon
yes, here

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCQQFjABahUKEwjI1qjtttzIAhVLGz4KHfxjBKY&url=http%3A%2F%2Fwww.atmos.washington.edu%2F~davidc%2Fpapers_mine%2FCatling2009_SciAm_AtmEscape_Preprint.pdf&usg=AFQjCNE-vlUw54iLGlGBqrCfCQJ1CQHcIw&sig2=09z2PlaTuIUXxwPV5ia5jQ
Answered by Damon
You are welcome.

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