Although gravity has remained an accepted theory and (relatively) free from controversy for centuries, one scientist is rocking the boat when it comes to one of our most basic laws of physics.

In 2006, the International Astronomical Union inflamed the nation when it revoked Pluto’s planetary status. When the former planet, formerly known as Pluto got downgraded, Americans overwhelmingly rallied to its defense. Now called a Plutoid, it forever has a place, if not in the planetary hierarchy, in Americans' hearts. Astrophysicist Neil deGrasse Tyson was at the frontline of Pluto’s reclassification and he’s captured, what he calls the “demotion commotion” in a new book: The Pluto Files: The Rise and Fall of America’s Favorite Planet.

Want to hear more from Neil deGrasse Tyson? Watch him on Nova's scienceNOW (a production of our partners WGBH) and if you live in New York City, he is lecturing at the 92nd Street Y.

"That's God's wife. Not only did he have a wife, but he had many girlfriends, too."
--Gary Glassman, from the upcoming Nova documentary on the Bible

Guest: Mary Ellen Klaus, Miami Herald