Eris was originally thought to be larger, but was determined to be slightly smaller when the probe actually made it out that far. Pluto, discovered in 1930, was at first thought to be larger than it is. For a long time, Pluto was believed to larger than Mercury but after the discovery of Charon (Pluto's largest moon) in 1978, the foundations of its planetary status started to wobble. In 2006, however, changes were made. However this theory has been heavily criticised because Pluto never actually … Because there was now a larger object than Pluto found orbiting the Sun, astronomers needed to decide whether this would be come the tenth planet. Stern is the principal investigator of the New Horizons mission to Pluto and the Kuiper belt. Tenth Planet, Dwarf Planet. It's believed that Eris has greater mass than Pluto, but it isn't larger. Once these changes became official, Pluto no longer fit the definition of a planet. The tiny body has a mass of only 1.31 x 10 22 kilograms, about two … Although all of the planets beyond Mars are gas giants, Pluto is small and rocky. In the 1950s it was suggested that Pluto was an escaped moon of Neptune, knocked out of orbit by its largest current moon, Triton. The existence of an Pluto, once believed to be the ninth planet, is discovered at the Lowell Observatory in Flagstaff, Arizona, by astronomer Clyde W. Tombaugh.

Pluto, discovered in 1930 , was at first thought to be larger than it is. Their book "Chasing New Horizons: Inside the Epic First Mission to Pluto," was published May 1 … Pluto's origin and identity have long puzzled astronomers. The truth is, nothing about Pluto changed, but the definition of a planet did. The New Horizons mission to Pluto and the Kuiper Belt - the first NASA launch to a new planetary target since Voyager more than 30 years ago - allowed the U.S. to complete the reconnaissance of the original nine planets of the solar system known at the birth of the space age. The word "planet" originally described wanderers of the sky that moved against the relatively fixed background of star. At the time, scientists thought it to be several times larger than it actually was; accordingly they placed it on the list of planets. In 2015, NASA's New Horizons Program flew past Pluto to take close-up photos and measurements of the dwarf planet, ultimately revealing that Pluto is bigger than scientists originally thought. Then came Pluto’s discovery. The word "planet" originally described wanderers of the sky that moved against the relatively fixed background of star.

Name one object in the belt larger than Pluto.

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