Our Solar Systems gas planets include
Jupiter, Saturn, Uranus, Neptune. You can tell a Gas Planet by its
density, (how tight the atoms are packed together.) Earth, which is not a gas planet, has
a density of 5.5. While Jupiter's density is 1.3. Many of the gas planets have mostly
hydrogen in them, and are hundreds of times larger than Earth in volume. The gas planets
are truly a wonderful part of our Universe.