An ass which is so large, that a probe or spaceship could land on it.
An ass planet is dangerous, that you
may get captured or lured into the ravein by the serpent
turd.
The only way to escape the crevice is if the serpent releases his methane-esque fumes, which escape at a rate high enough to compel you into deep space.
An ass planet does not have an atmosphere, the only thing surrounding it is the fumes it has excreted from its
core.
NASA has discovered a habitable planet, the ass planets! They are round, foul-smelling,
squishy planets. Many think that when we achieve landing, we
may lick the hole beneath the poopy anus crater!