Luna has always loved the night sky. She's an eleven-year-old who knows everything there is to know about space, and dreams of one day becoming an astronaut. The first step in her plan to get there is to ace the space unit in her science class and secure a spot in NASA's summer space camp. But when Luna's teacher is unexpectedly replaced with a substitute, Ms. Manitowabi, who is looking to shake up science class by bringing in art, Luna's carefully laid plans are crushed. And that's not all that's shifting in Luna's life — changes at home and in her friendships have her feeling topsy-turvy. What on Planet Earth is happening? is an endearing, poetic look at the inner world of a middle schooler grappling with change from acclaimed author and illustrator Danielle Daniel.