Originally posted by Phenom
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Earth's atmosphere is 100 times thinner than Venus's atmosphere.
Earth atmosphere mass: 5.1 x 10^18 kg (18 zeros)
Venus atmosphere mass: 4.8 × 10^20 kg (20 zeros)
The Earth is about 20% more massive than Venus, has a marginally better ability to retain atmosphere.
Assuming, prevailing thought is right, and the Earth and Moon are the result of 2 bodies colliding billions of years ago, that collision would have blown off most of Earth's atmosphere.
Even Titan --- one of Saturn's moons --- has a atmosphere more massive than Earths!!!! "It is also about 1.19 times as massive as Earth's overall" --- Wikipedia.
Short version: A normal Earth-sized planet should have very thick atmosphere like Venus. If Titan, just a little larger than our moon, has a more massive atmosphere than Earth, that is a sign the size of our atmosphere being so small is very odd.
---- Things like the above make the Earth seem like a very weird planet, and we are looking like the beneficiary of some oddball events in the Earth's history.
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