Mona is earth-bound. Kiki is mission control. Bart has a galactic space obsession. And Zane's thinking is off the planet. The Secret Science Society need to come up with a prize-winning experiment. Will their excursion to the Planetarium be over the moon? Do they really build a rocket ship to put a dog in space? And will they solar-brate a win at the Science Expo? With Zane's mystery modifications this can only mean one thing: An astronomical DISASTER! But ssssshhhhh, the ending is out of this world.