Here's why:
* Composition: Jupiter is primarily composed of hydrogen and helium, the lightest elements in the universe. These elements are gases at standard temperatures and pressures.
* Size: Jupiter is the largest planet in our solar system, with a diameter 11 times that of Earth.
* Lack of Solid Surface: Jupiter doesn't have a solid surface like Earth or Mars. Its atmosphere gradually becomes denser with depth, but there isn't a clear boundary.
The other giant gas planets in our solar system are Saturn, Uranus, and Neptune.
