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There is an article in Syy&Telescope that contains a new theory. I did not read it fully yet, but seems Magnetic Field was/is not a factor. It shows Venus, Ma
by jmclnx 3y ago
There is an article in Syy&Telescope that contains a new theory. I did not read it fully yet, but seems Magnetic Field was/is not a factor.
It shows Venus, Mars and Earth is loosing isotopes(?) at about the same rate.
Plus, Venus has no Magnetic Field to speak of and its atmosphere is far denser than Earths.
- Sharlin 3y agoYep, the article is behind the times. The lack-of-magnetic-field hypothesis isn't even the preferred one anymore I believe.
- leptons 3y agoVenus' atmosphere is mostly carbon dioxide and sulphuric acid which is a far different composition than Earth's atmosphere. My guess is the heavier molecules that make up the atmosphere are what makes it far denser than Earth, and gravity likely has much more to do with it than magnetism.
- dredmorbius 3y agoMars's atmosphere is also predominantly CO2, though far thinner. That's ... somewhat to be expected of any non-life-bearing rocky planet. Free oxygen is unstable, lighter elements (hydrogen, ammonia) would tend to boil off with either low gravity or (relatively) high temperatures (as opposed to the ice-moons of Jupiter and Saturn, especially Titan).
- wheelerof4te 3y agoNot to mention Jupiter's or Saturn's magnetic fields, that are far less dense than Earth's, yet both planets have massive gaseous atmospheres.