Mike's discovery caused an uproar. Astronomers around the globe asked: What is a planet anyway? As a kid, Mike Brown gazed at his poster of the nine planets and wondered: Is there more out there? The hunt was on. This nonfiction picture book tells the story of astronomer Mike Brown, from his childhood, to his growing curiosity about our solar system, to his amazing discoveries.

Mike's discovery caused an uproar. Astronomers around the globe asked: What is a planet anyway? As a kid, Mike Brown gazed at his poster of the nine planets and wondered: Is there more out there? The hunt was on. This nonfiction picture book tells the story of astronomer Mike Brown, from his childhood, to his growing curiosity about our solar system, to his amazing discoveries.