Group R The Gas Giant Planets
A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core. The gas giants of our solar system are Jupiter, Saturn, Uranus and Neptune. These four large planets, also called jovian planets after Jupiter, reside in the outer part of the solar system past the orbits of Mars and the asteroid belt giants. Although there are only four large planets in our own solar system, astronomers have discovered thousands outside of it, particularly using NASA's Kepler space telescope. These exoplanets (as they are called) are being examined to learn more about how our solar system came to be. Jupiter is the largest planet in our solar system. It has a radius almost 11 times the size of Earth. It has 50 known moons and 17 waiting to be confirmed, according to NASA. Saturn has very large rings and is 9 times. Uranus is the only planet tilted on its side and is half the size of Jupiter. Neptune also has a radius half the size of Jupiter. Like Uranus, its atmosphere is mostly made up of hydrogen, helium and methane.
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