Neptune Completes Only One Revolution Since Discovery

Neptune, the eight planet of the solar system completed its first orbit around the sun on July 12, 2011.Thirty times farther than Earth, the blue-green planet named after Roman God of Sea completes one revolution approximately every 165 years.

Neptune, which is also the farthest planet from sun, was discovered on September 23, 1846. Galileo first found Neptune in 1612 and mistook it for a star. We know now that he was actually looking at Neptune. In 1846, Galle used a telescope to locate Neptune using calculations from other astronomers that approximated where an 8th planet should be. Since then, we have been able to observe Neptune with the Voyager 2 spacecraft.