Description: Our Planet | One Planet | FULL EPISODE | Netflix, TRAPPIST-1: The Most Incredible Habitable Planetary System, Our Planet | From Deserts to Grasslands | FULL EPISODE | Netflix, The Blue Planet Collection | Part 1 | BBC Earth
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Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to ac
Clyde Tombaugh 's discovery of Pluto in 1930 appeared to validate Lowell's hypothesis, and Pluto was officially named the ninth planet. In 1978, Pluto was conclusively determined to be too small for its gravity to affect the giant planets, resulting in a brief search for a tenth planet. The search was largely abandoned in the early 1990s, when a study of measurements made by the Voyager 2 spacecraft found that the irregularities observed in Uranus's orbit were due to a slight overestimation of Neptune's mas
Planet 51 is a 2009 British-Spanish animated science fiction/family comedy film directed by Jorge Blanco, written by Joe Stillman , and starring Dwayne Johnson , Jessica Biel , Justin Long , Gary Oldman , Seann William Scott , and John Cleese . Produced by Madrid-based Ilion Animation Studios and HandMade Films , it was originally acquired for U.S. distribution by New Line Cinema , but then sold to Sony Pictures before it was completed. Planet 51 was released on 20 November 2009, by TriStar Pictures . It wa