Alan Stern has never been happy with Pluto's demotion to dwarf planet. Principal investigator of NASA's New Horizons mission, he told Gizmodo the International Astronomical Union's new definition of a planet, which excludes Pluto, is "bullshit." So he and a team of other NASA scientists have submitted a proposal to the IAU to once again refine the definition of what makes a planet, which would not only include Pluto, but also pretty much any round object in space that is smaller than a star. In the introduction of the new proposal, the scientists express concern that Pluto's demotion to dwarf planet diminishes its standing in the public perception.