It finally looks like they will define what a planet is. The International Astronomical Union members will vote on Aug. 24 to accept or reject the following definition of a planet:
A planet is a celestial body that (a) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (b) is in orbit around a star, and is neither a star nor a satellite of a planet.
If it gets approved, we’ll have 12 planets in our solar system with 12 more that need more review before being considered a planet. I think we should leave the term “planets” just for the 8 planets we all agree on.
You can read more from space.com.