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By: Capri Planets Jan.21, 2008 Mercury is the closest to the sun. It’s a little bigger then the earth’s moon. It is covered in craters. Venus Venus is the closest to the sun. Venus is smaller than earth. It has temperatures that can melt lead. Earth Earth is the largest rocky planet. Earth was formed about 4.5 million years ago. Earth is the only planet with water. Mars Mars is a bright red planet in the sky. Mars was named after the roman gods. The radish color was caused by rust. Jupiter Planets do not have the same kind of layers. The core is made of rock and metal. Jupiter is the biggest in our solar system. Uranus Uranus was discovered in 1781. Uranus is made of ice. Uranus was named after the Greek gods. Saturn Saturn is the second largest planet in our solar System. Saturn is also very bright in the sky. The rings of Saturn were first seen in 1655. Neptune Neptune was discovered in 1846. Neptune is usually the eighth planet from the sun. Neptune was named after the ancient god of the sea. Pluto Pluto is the ninth planet in our solar system. Pluto was discovered in 1930. Pluto is very small and far from the sun.