Comet Together! (The Cosmic Adventures of Astrid and Stella Book #4 ...

"Astrid and Stella love reading comet books and are on a mission to make one of their own. But when they run into creative differences, the dynamic duo must figure out if they can work together to take their creation to the next level. Next, Stella is on a quest to discover if robots are helpful friends or evil machines. Bobo takes the buddies planet hopping to see if robots deserve a one-star or a five-star review. Along the way, the Friend Ship crew will encounter a new friend-Time Travel Tiger-whose tools from the future (and the past!) help them complete their mission"--