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After 76 years of classification as a planet, Pluto was demoted in 2006 to a dwarf planet, in part because of its size but also because of its minor gravitational effects on the bodies around it.


NASA’s New Horizons mission has answered one of the most basic questions about Pluto—its size. How Big Is Pluto? New Horizons Settles Decades-Long Debate | NASA


Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune. It was the first Kuiper belt object to be discovered and is the largest known plutoid (or ice dwarf). Pluto was discovered by Clyde Tombaugh in 1930 and was originally considered to be the ninth planet from the Sun.


In other words, you could put almost 170 objects the size of Pluto inside the Earth. The mass of Pluto is 1.3 x 10 22 kg, which is only 0.2% the mass of the Earth, or 18% the mass of the Moon.


NASA's New Horizons mission has answered one of the most basic questions about Pluto—how big is it?. Mission scientists have found Pluto to be 1,473 miles in diameter, somewhat larger than many prior estimates. Images acquired with the spacecraft's Long Range Reconnaissance Imager, or LORRI, were used to make this determination, confirming what was already suspected: Pluto is larger than a...


The other day someone asked me, “How big is the planet Pluto?”. I always respond to this question by providing an answer in miles, but what I really want to do is give an answer that makes it easier for the person to really understand. How Big Is Pluto? The physical size characteristics of Pluto […]


At a press conference, New Horizons' top dog Alan Stern just announced that his team has calculated Pluto's most accurate diameter yet: about 1,473 miles from one end to the other, give or take 12 ...


It is about half the size of Pluto and about eight times less massive. The new observations put Charon's diameter at between 750 and 753 miles (1,207 and 1,212 kilometers).


To help space enthusiasts conceptualize Pluto’s size, NASA created a graphic comparing Earth, Pluto and Charon, Pluto’s largest moon. For more Pluto coverage, check out 9 Facts About Pluto You ...


Discovered in 1930, Pluto is the second closest dwarf planet to the Sun and was at one point classified as the ninth planet. Pluto is the largest dwarf planet but only the second most massive, with Eris being the most massive. Facts Pictures Moons Diagrams New Horizons Mission Pluto Dwarf Planet Profile Pluto Diagrams Facts […]