For ages, people have looked to the sky and have been fascinated with the celestial bodies of the cosmos. Our solar system for example; it is made up of planets with a variety of characteristics. Mercury, Venus, and Mars have chemical and physical properties similar to Earth and are all referred to as terrestrial planets. The word 'terrestrial' comes from the Latin word terra, meaning "Earth",and terrestris from latin meaning '"earthly, of the earth, on land"

On the other end of the spectrum are the gas giants known as the Jovian planets. These are Jupiter, Saturn, Uranus, and Neptune. They are labeled Jovian after Jupiter, the largest of the group. The word 'Jovian' comes from Jove, another name for the Roman god Jupiter.

Gas Giant is a large planet of relatively low density consisting predominantly of hydrogen and helium.

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