M-class
A planet that looks like it was made by someone who only knew how to use a lawnmower and a dirt bike. It's all hills and curves, like it got hit by a f***ing rollercoaster.
My teacher said Mars is an M-class planet. I asked why and she just said 'because it's annoying.'
I tried to build a robot for an M-class planet and it just fell apart.
My mom thinks Earth is an M-class planet. She says it's 'too bumpy for a real planet.'