Planets

A planet is defined as a celestial body orbiting a star or stellar remnant that is large enough to be rounded by its own gravity. There are nine planets in the Solar System. In increasing distance from the Sun, they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.

Picture Gallery 25 Images over 2 pages. [1] [2]

Anniversary rings on Uranus © Photo courtesy of NASA Until the discovery of Uranus' rings 25 years ago, astronomers believed Saturn was the only ringed planet. It is now known that all four of our Solar System's gas giants have rings.

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NASA
NASA was established by President Eisenhower in 1958. Follow NASA as they explore: Earth, Moon, Mars and beyond.