Which planet's atmosphere most resembles to Earth's?

Answer 1

Venus

Venus is sometimes regarded as Earth's sister planet. In some ways they are very similar:

• Venus is only slightly smaller than Earth (95% of Earth's diameter, 80% of Earth's mass).
• Both have few craters indicating relatively young surfaces.
• Their densities and chemical compositions are similar.

Because of these similarities, it was thought that below its dense clouds Venus might be very Earthlike and might even have life. But, unfortunately, more detailed study of Venus reveals that in many important ways it is radically different from Earth. It may be the least hospitable place for life in the solar system.

Mars

Although Venus has a close elemental similarity, Mars has the closest physical structure, as it has retained usable gaseous carbon dioxide and liquid water. However, just as Venus has an atmosphere that is too dense, Mars is conversely too small to provide suitable atmospheric density.

Titan

Saturn's largest moon has an atmosphere that is analogous to Earth's, but much colder. It has nitrogen, oxygen, and some water. However, the thick atmosphere is so cold that water is always solid ice. Methane is instead the compound that exists as a gas, liquid, or frozen solid.

Answer 2

This is kind of a difficult question, because none of the planets has an atmosphere that's much like Earth's. The answer would have to be either Venus or Mars (Mercury has no atmosphere to speak of, and the outer planets are essentially ALL atmosphere).

Venus' atmosphere is much thicker than Earth's (surface pressure about 90x Earth's), and Mars' is much thinner (about 1/90th that of Earth... don't read too much into this, I've played a little fast and loose with the numbers to make it come out symmetrical like that).

If I had to choose one, I'd say Mars.

Answer 3

The structure of Jupiter is very unlike that of the Earth. The visible surface is, in fact, the uppermost layers of clouds of methane and ammonia. The interior of Jupiter is made up of a solid core of material similar to that of the Earth with a diameter of about 24,000 km (13,000 mi). Surrounding this, with a diameter of about 100,000 km (56,000 mi), is a metallic mixture of hydrogen and helium. On the Earth we know these two as gases which at very low temperatures can be liquefied; in Jupiter's interior the pressure is so high that the hydrogen takes up a state in which it behaves like a metal. Outside this metallic hydrogen zone is a shell of liquid molecules, mainly hydrogen and helium, with the cloudy atmosphere, about 1000 km (560 mi) deep, above. The temperatures in Jupiter's atmosphere are very cold ranging from -130°C (-200°F) at the top of the clouds to 30°C (90°F) about 70 km (45 mi) below.

Answer 4

Mars because if there would be a planet that we could live on, it would be mars. Most capable of life.

Answer 5

Venus - even though they are VERY different.

Answer 6

There is no planet with an atmosphere remotely like Earth's.

Answer 7

None of the planets in the solar system has an atmosphere much like Earth's, so it's kind of difficult to answer that. Mars is probably the best candidate, though it's much thinner.

Answer 8

Mars