Double Planets
Double Planets are 2 sets of planets revolving around each other such that their common centre of mass (barycentre) lies outside both of them. In case the barycentre lies on one of them, then the body which possesses the barycentre is the planet, and the other body is the moon.
All this is important due to the new definition of a planet that is going to be debated on Aug 24.
All this is important due to the new definition of a planet that is going to be debated on Aug 24.