NASA Administrator Jared Isaacman wants to put an end to a decades-long debate among scientists. Is Pluto a planet or not?
Isaacman says it should be — but it hasn’t been one for 20 years. That’s because of a decision from the International Astronomical Union, which said it met the definition of a dwarf planet due to the other objects that orbit chilly Pluto. But, critics point out that Earth and Jupiter share orbital space with asteroids and research since 2006 has revealed more about Pluto.
