Neptune was actually seen by Galileo Galilei in 1612, but he thought it was a star.
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Physical Features
Neptune is so big that about 57 Earths could fit inside it.
One day on Venus is longer than its year!
Neptune moves along its orbit at a speed of about 12,000 miles per hour (5.43 km/s).
Some of Neptune’s moons were discovered by the Voyager 2 spacecraft when it flew past in 1989.