NASA's Spitzer Space Telescope was able to detect a super Earth's direct light for the first time using its sensitive heat-seeking infrared vision. AFP PHOTO / NASA / JPL / CALTECH
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This Planet 9, as the two California Institute of Technology researchers call it, hasn't been spotted yet.Once it's detected, Brown insists there will be no Pluto-style planetary debate. Brown ought to know; he's the so-called Pluto killer who helped lead the charge against Pluto's planetary status in 2006 . The Caltech researchers prefer calling it Planet 9, versus the historical term Planet X.The orb -- believed to be 10 times more massive than Earth and 5,000 times more massive than dwarf Pluto -- may well have rings and moons.The last real planet to be discovered in our solar system was Neptune in 1846 . Pluto, discovered in 1930, was once the 9th planet but is now considered a dwarf planet in the Kuiper Belt. Brown realizes skepticism will exist until the planet is actually observed.
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