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Status - 26 kg[7 Neptune is an intermediate body between...

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Status From its discovery in 1846 until the subsequent discovery of Pluto in 1930, Neptune was the farthest known planet. Upon Pluto's discovery Neptune became the penultimate planet, save for a 20-year period between 1979 and 1999 when Pluto's elliptical orbit brought it closer to the sun than Neptune. [38] The discovery of the Kuiper belt in 1992 led many astronomers to debate whether Pluto should be considered a planet in its own right or part of the belt's larger structure. [39] [40] In 2006, the International Astronomical Union defined the word "planet" for the first time , reclassifying Pluto as a " dwarf planet " and making Neptune once again the last planet in the Solar System. [41] Composition and structure A size comparison of Neptune and Earth With a mass of 1.0243×10
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Unformatted text preview: 26 kg , [7] Neptune is an intermediate body between Earth and the larger gas giants : its mass is seventeen times that of the Earth but just 1/19th that of Jupiter . [12] The planet's surface gravity is only surpassed by Jupiter . [42] Neptune's equatorial radius of 24764 km [9] is nearly four times that of the Earth. Neptune and Uranus are often considered a sub-class of gas giant termed " ice giants ", due to their smaller size and higher concentrations of volatiles relative to Jupiter and Saturn . [43] In the search for extrasolar planets Neptune has been used as a metonym : discovered bodies of similar mass are often referred to as "Neptunes", [44] just as astronomers refer to various extra-solar bodies as "Jupiters"....
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