Neptune had been discovered by Galileo, he had recorded it as a fixed star during observations with his small telescope in 1612 and 1613.
Other facts about Neptune
•Neptune has 2 thin rings.
•Neptune is the windiest planet in our solar system.
•Neptune has a big storm called "The Great Dark Spot" much like Jupiter.
Webcites
Dunford, Bill. "Planets - NASA Solar System Exploration." NASA. Ed. Phillips Davis and Alice Wessen. NASA, n.d. Web. 02 Mar. 2017. <http://solarsystem.nasa.gov/planets/>.
Merrifield, Michael, and Amanda Bauer. "What+is+the+mass+of+neptune - Google Search." What+is+the+mass+of+neptune - Google Search. N.p., n.d. Web. 02 Mar. 2017. <https://www.google.com/search?q=what%2Bis%2Bthe%2Bmass%2Bof%2Bneptune&rlz=1C9BKJA_enUS719US719&oq=what%2Bis%2Bthe%2Bmass%2Bof%2Bne&aqs=chrome.1.69i57j0l3.16886j0j7&hl=en-US&sourceid=chrome-mobile&ie=UTF-8>.