DEL DEBATES NEIL DEGRASSE TYSON
The Highwire with Del Bigtree
00:00
The Rise and Fall of America's Favorite Planet
In the 1990s we discovered icy bodies in the outer solar system that rivaled Pluto in size. And so what we concluded was Pluto wasn't so much the ninth planet. The International Astronomical Union, which has as their duty to establish nomenclature and categories said we have a new definition of a planet. "Pluto is now a dwarf planet. It's still a planet," says Neil deGrasse Tyson. 'I think it's happier that way'
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