Infuriated by the declaration that Pluto is no longer a planet, President Penguin and his penguins invade Earth and it is up to Ricky and his robot pal to defeat them--with some help from Ricky's cousin Lucy and her pets.

The solar system most of us grew up with included nine planets, with Mercury closest to the sun and Pluto at the outer edge. Then, in 2005, astronomer Mike Brown made the discovery of a lifetime: a tenth planet, Eris, slightly bigger than Pluto. But instead of adding one more planet to our solar system, Brown’s find ignited a firestorm of controversy that culminated in the demotion of Pluto from real planet to the newly coined category of “dwarf”...

"People, children especially, have been baffled, bewildered, and even outraged by the fact that Pluto is no longer called a planet. Through whimsical artwork and an entertaining dialog format, this book explains why this is so. Providing a history of the small, icy world from its discovery and naming to its recent reclassification, this book presents a fascinating look at how scientists organize and class our solar system as they gain new insights...

What's the most famous dwarf planet? Pluto! It's so far from the sun that very little heat and light reach it. Pluto is dark, cold, and covered with ice. Discover these and other fascinating facts about Pluto.

Very basic information about Pluto and other dwarf planets.

"Orbiting at the edge of the outer Solar System, Pluto is an intriguing object in astronomy. Since the fascinating events surrounding its discovery, it has helped increase our understanding of the origin and evolution of the Solar System and raised questions about the nature and benefits of scientific classification. This is a timely and exciting account of Pluto and its satellites. The author uses Pluto as a case study to discuss discovery in astronomy...

"Follow a spacecraft the size of a piano, named New Horizons, on the first ever spacecraft mission to Pluto, the space entity formerly known as a planet, in the latest addition to the epic and authoritative Scientists in the Field series."--

Shares a behind-the-scenes account of the science, politics, egos, and public expectations that shaped the New Horizons' mission to Pluto and beyond, citing the endeavor's boundary-breaking achievements and how they reflect the collective power of shared human goals.

"Cuando Stink se entera de que Plutón reprobó la Prueba de Planeta por ser demasiado pequeño, no tiene más remedio que ponerse del lado de los planetas chiquitos (y la gente chiquita de todas partes)."-- When Stink discovers that Pluto has been downgraded from a planet to a dwarf planet, he launches a campaign in his classroom to restore its status to that of a full-fledged member of the solar system.