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Outside of the earth, no other body in the solar system has an atmosphere containing oxygen
at a pressure and temperature that the human body can use.

Mercury, earth's moon, and the majority of the other satellites known in the solar system, have
no atmospheres at all.

Venus has an atmosphere that's 96% carbon dioxide, and a surface air pressure about 90 times
what it is on earth. (Barometer on Venus would read about 2,700 inches !)

Mars has so little atmosphere that you wouldn't notice it if you were standing there.
(Barometer on Mars reads about 0.3 inches !)

Jupiter, and many of the solar system's satellites, have atmospheres consisting mainly of methane,
the gas that comes bubbling up out of earth's swamps.

Saturn's atmosphere is mostly hydrogen, Uranus' and Neptune's are mixes of hydrogen and helium,
and Pluto's whispy atmosphere is a bunch of low pressure clouds in equilibrium with ices of water
and methane on the surface.

It's a free country, and to each his own, but personally, the idea of trying to breathe on any of these bodies
doesn't attract me. Before blasting off on a mission to any of those places, I'd want to make sure I had a
bottle of warm oxygen with me, just in case I needed a toot from time to time after I landed.

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15y ago

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