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Dec
29
awarded  Yearling
Sep
23
revised Why Earthian atmosphere is so thin?
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Sep
23
comment Why Earthian atmosphere is so thin?
1. The "faint sun" paradox amounts to merely 30% less luminosity at 4.2Gya (this is touched in Levenspiel's overview). However, if Mars was warm enough back then, Earth should have been exceedingly hot. 2. Venus never had oceans. Even more so, according to D.Catling, Mars never had oceans either, yet it also lost most of its atmosphere (he considers impact erosion as possible primary factor). 3. As I said, tectonics should make the atmosphere thicker, not thinner.
Sep
23
answered Why Earthian atmosphere is so thin?
Sep
23
comment Why Earthian atmosphere is so thin?
Unfortunately, yours is also not an answer I was looking for. You're not addressing any issues with dpwilson's answer, do not cite any established theories, don't address any specific mechanisms for Eartian atmosphere absorption, etc.
Sep
23
comment Why Earthian atmosphere is so thin?
"Atmospheric gases never left Earth, they're in it" - this is the only promising part of your answer, the rest is raising more questions than my original question (in particular, if Mars is to be considered as well). :)
Aug
10
awarded  Editor
Aug
10
revised Why Earthian atmosphere is so thin?
Typo in the title
Aug
9
awarded  Student
Aug
3
asked Why Earthian atmosphere is so thin?
Nov
12
awarded  Yearling
Jan
10
comment Why are planets spherical?
Also related: astronomy.stackexchange.com/questions/1102/…
Dec
12
answered Brightest Radio Source In the Universe
Dec
10
answered What are the current accepted theories of the formation of the Uranian moon Miranda?
Dec
10
comment What are the current accepted theories of the formation of the Uranian moon Miranda?
I'd rather say it's too small to be called a "world". Giant rock will be a better term, and those are seldom of regular shape.
Dec
10
comment Is the rotation of the Sun and the rotation/orbit of the Moon around the Earth a coincidence?
scienceforums.net/topic/…
Dec
5
comment What is the maximum transmission distance of the radio signal in the outer space which could still be understood?
physics.stackexchange.com/a/87997/30000 - check out this related question. As radio transmitters are just another variety of light sources when astronomy is concerned, we will need transmitters comparable in power to stars to make them visible on the inter-star distances (we can gain some signal power through focusing, but even best focusing will still require 1 millionth of "hot Jupiter" power output, which is rather huge).
Dec
3
answered Could Venus be a source of Earth's water?
Nov
19
answered How do scientists determine the age of stars?
Nov
12
awarded  Teacher