Most rocks on the surface of the moon seem to be between 3 and 4.6 billion years old. The moon provides evidence about the early history of the solar system not available on Earth. Venus is the second planet from the sun and the sixth largest. It is the brightest object in the sky except for the sun and the moon. Venus is usually visible with the naked eye.
Earth is the third planet from the sun and the fifth largest.
Earth is 4.5 to 4.6 billion years old, but the oldest known rocks are about 4 billion years old, and rocks older than 3 billion years are rare. Mars is the fourth planet from the sun and the seventh largest. Mars has been known since prehistoric times. Jupiter is the fifth planet from the sun and by far the largest. Saturn is the sixth planet from the sun and the second largest.