12 planets!

So the Universe as we knew it will change. Now three more celestial
bodies in the solar system will be elevated to planets. Actually one of
them, Ceres, had been a planet in the 19th century and had been demoted.
This lies between Mars and Jupiter, and was until now the largest
asteroid. The other trans-Plutonian (certainly trans-Neptunian) objects
in this hallowed list are Charon and (yikes!) Xena. Hope the name
of the last one will be chosen to be something else.