For many years, there has been a raging argument about whether Pluto should be regarded as a planet. However, when a Caltech based research team announced the discovery of a celestial body that is about two times as big as Pluto, it sent astronomers spinning. Recently, NASA confirmed that the object discovered is indeed a planet, although many still argue about that definition. What is the planet that was newly discovered? What criteria determine a planet? And just what is going on in our celestial backyard?
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