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Pluto's reign. For decades, students learned the phrase "My Very Educated Mother Just Served Us Nine Pizzas" to remember the order of the planets in the solar system: Mercury, Venus, Earth, Mars ...
The Pluto–Charon system is one of the few in the Solar System whose barycenter lies outside the primary body; the Patroclus–Menoetius system is a smaller example, and the Sun–Jupiter system is the only larger one. [154] The similarity in size of Charon and Pluto has prompted some astronomers to call it a double dwarf planet. [155]
The replaying of events includes the adversarial challenging of long-held scientific beliefs between some of the world's leading astronomers and the eventual 2006 International Astronomical Union's vote that removed Pluto from the list of Solar System planets. [1]
The category of 'plutoid' captured an earlier distinction between the 'terrestrial dwarf' Ceres and the 'ice dwarfs' of the outer Solar system, [39] part of a conception of a threefold division of the Solar System into inner terrestrial planets, central giant planets, and outer ice dwarfs, of which Pluto was the principal member. [40] '
For 76 years, Pluto was considered our solar system's ninth planet — so, what caused it to lose its status?
Pluto was considered a planet up until 2006, when researchers at the International Astronomical Union voted to "demote" it to dwarf planet.
Some may have escaped the Solar System altogether to become free-floating planets, whereas others would be orbiting in a halo around the Solar System, with orbital periods of millions of years. This halo would lie at between 1,000 and 10,000 AU (150 and 1,500 billion km; 93 and 930 billion mi) from the Sun, or between a third and a thirtieth ...
For 76 years, Pluto was considered out solar system's ninth planet. So what caused it to lose its planetary status? Find out on this episode of "Space, Down to Earth"!