It’s official: Pluto is no longer a planet. It’s a “dwarf planet”, along with former asteroid Ceres and former planet contender Xena.

The backlash has been fairly predictable, as well as amusing. Consider this bumper sticker:

Or this billboard:

Or even this t-shirt (“Will all planets please step forward? … Not so fast, Pluto.”)

And, predictably, a milk carton:

Regardless, it’s fun to watch the solar system get re-defined, and wonder how our kids will perceive it as they’re taught these new definitions and theories in school.