Facts About the Planet Neptune: Fun/Interesting ...
1. Neptune is the fourth largest planet in the Solar System. 2. Neptune is a gaseous planet, composed of hydrogen, helium, methane, with traces of ammonia and water. 3. Neptune was discovered by Urbain Le Verrier, John Couch Adams, and Johann Galle on September 23, 1846. 4. The only spacecraft ever to visit Neptune was […]
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