Celeste is a little girl who wants to explore the Universe, find new Earths and know how to find exoplanets. While Celeste is fighting off sleep in her room by reading a book on astronomy she receives an unexpected visit from Moon. Together, they will enjoy a journey through the Universe to discover what exoplanets are and how they can be detected. They observe rogue planets, oceanic worlds and super-Earths. Moon tells her about exoplanet hunters, who observe the sky in search of planets like Earth.