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Any atmosphere by definition is made of gas.
This one...the earth. The other planets are made up of critical gases,like methane, with frozen planets like Pluto made up of layers of frozen gases, such as a suspected layer of oxygen underneath layers of nitrogen and methane, and sulfuric gases which tend to snow out on the cold side of the planet.
Gas giants are planets whose atmosphere is predominantly composed of gases, such as hydrogen and helium. These planets have a small solid core surrounded by thick layers of gas. Examples of gas giants in our solar system include Jupiter and Saturn.
The atmosphere of Earth is made up of a mixture of gases, primarily nitrogen (78%) and oxygen (21%). Other gases present in smaller amounts include argon, carbon dioxide, and water vapor.
Life probably does not exist on any of the known planets (except earth). But if life does exist on one of those planets, it would probably be on Mars. Venus is way too hot, Mercury does not have an atmosphere, and the other four planets are made up almost entirely of gas.
Jupiter, Saturn, Uranus, and Neptune are gas giants, composed primarily of hydrogen and helium with smaller amounts of other materials. These planets have thick atmospheres that make up the majority of their mass.
Earth's atmosphere is made up of 78% nitrogen and 21% oxygen. The other 1% is other gases.
The other type of planet is terrestrial, which is made up of mostly rock and metal. Terrestrial planets, like Earth, have a solid surface and a thin atmosphere compared to gaseous planets like Jupiter or Saturn.
The whole planets made up of gas, and underneath that is a layer of liquid and then a hard rocky core.
because they are made up of gas
Earth's atmosphere is mostly made up of nitrogen, which makes up 79 percent. The atmosphere contains 20 percent oxygen and 1 percent other gases.
the inner planets made up of rocks while the outer planets are made up of gases and liquids.