The Space Mission Adventure (Clubhuse Mysteries, Bk. 4)

Ziggy and his friends are excited to be going to Space Camp, where they'll get to learn about weightlessness and how astronauts eat - and use the bathroom - in space. But Ziggy has another goal: he wants to meet some aliens. Purple, three-headed Martians, preferably, just like in his Mega Mighty Martian Blaster game. Once he gets to camp, Ziggy learns that real-life space travel is even more exciting than what he has imagined. But when a mysterious shiny stone appears, Ziggy can't help but wonder if his dream of alien contact has just come true. . . .