Venus
Venus is sometimes regarded as Earth's sister planet. In some ways they are very 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.
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.
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.
About 100 extrasolar planets are thought to have been discovered. All are giants and probably most resemble Jupiter
Venus has the most carbon dioxide atmosphere among the planets in our solar system, with over 96% of its atmosphere composed of CO2.
There are two such planets, Mars and Venus. Venus has a much thicker atmosphere than Mars, but both atmospheres are about 95% carbon dioxide.
Most known extrasolar planets are categorized as "hot Jupiters," massive gas giants that orbit close to their host star. These planets are similar in size to Jupiter but have high surface temperatures due to their proximity to the star.
Oxygen makes up 21% of the Earth's atmosphere. It is essential for respiration in most living organisms, supporting life on Earth.
no
About 100 extrasolar planets are thought to have been discovered. All are giants and probably most resemble Jupiter
The weight.
Blue.
Closest to the earths serfus.
Nitrogen
the troposphere
which layer contains most of earths ozone
the troposphere
Nitrogen makes up most of our atmosphere. Second is Oxygen.
Most kinds of weather occurs in the troposphere, the lowest level of the atmosphere.
Nitrogen has made up the largest portion of Earth's atmosphere for most of Earth's history. It currently makes up about 78% of the atmosphere.