A gas giant is a type of planet that is primarily composed of gases, such as hydrogen and helium, and has a relatively low density compared to terrestrial planets.
The main components of a gas giant include hydrogen, helium, and small amounts of other gases such as methane and ammonia. These gases are found in layers, with the heavier ones closer to the core.
Gas giants are believed to form through a process called accretion, where a large amount of gas and dust in a protoplanetary disk gradually clump together to form a planet. Gravity then compresses the gas and dust into a dense core, which attracts more gas and continues to grow into a gas giant.
The main difference between a gas giant and a terrestrial planet is their composition. Gas giants are primarily made up of gases, while terrestrial planets are composed of rocks and metals. Gas giants also tend to be much larger and have a lower density than terrestrial planets.
It is unlikely that life can exist on a gas giant due to the extreme conditions, such as high atmospheric pressure and lack of solid surfaces. However, some scientists believe that it is possible for life to exist on the moons or other satellites orbiting a gas giant.