Pluto might get a second chance at being a planet. A group of NASA scientists has submitted a request to the International Astronomical Union (IAU) to broaden the definition of what classifies as a planet. If the new definition were to win IAU's approval, Pluto — presently considered a "dwarf planet" — and 109 other space objects would become planets.
Pluto lost its planetary status in 2006 after the IAU voted in favor of a new, three-part definition of what it takes to be a planet. Pluto met two of the three criteria, as it orbits around the sun and has sufficient mass to maintain the round shape characteristic of planets. However, Pluto is just not big enough to clear other objects out of its orbital space, and thus it was downgraded from the planetary status it had held since 1930.
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