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Pluto used to be a full-fledged planet, and then in 2006 it wasn't. But the debate over its status continues, and you can watch one discussion live tonight.
The International Astronomical Union's 2006 decision to demote Pluto to a "dwarf planet" takes center stage in a debate at 8 p.m. EDT (0000 April 30 GMT) by the Philosophical Society of Washington in Washington, D.C. You can watch live here, in the window above, or directly from the PSW Science group here.
Alan - Stern - Investigator - New - Horizons
Alan Stern, the principal investigator of the New Horizons mission that flew past Pluto in 2015, has been a fierce advocate of Pluto remaining a planet. He will battle it out with Ron Ekers, a past president of the International Astronomical Union (IAU) who led the organisation from 2003 to 2006, when Pluto's demotion occurred. The IAU is...
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