The Fantastic Flatulent Fart Brothers Go to the Moon!: A Spaced Out Comedy SciFi Adventure that Truly Stinks (Humorous action book for preteen kids age 9-12); US edition

Willy and Peter need to get as far as possible from their sister’s dumb kindergarten pageant. But they never expected to be blasting their butts into space! There they make a disgusting discovery that could wipe out the Moon in one gross stink bomb.

Do they have enough gas in their guts to repel an alien invasion from Uranus? Can farts alone rocket them back to earth? And how did their sister’s hamster get on board and chew up all the cables?

Note that this is the US spelling edition.