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Demoting Pluto: The Discovery of Dwarf Planets
This title covers these subjects: Pluto (Dwarf planet), Planets.
Demoting Pluto: The Discovery of Dwarf Planets
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Reviewed Titles Accelerated Reader

Demoting Pluto: The Discovery of Dwarf Planets

When is a planet not a planet? Dwarf planets orbit the sun, are solid bodies, and are not moons. But they are not considered regular planets. Learn more about these spherical oddities and why Pluto is still hotly debated today.

Reading LevelGrades 3-4
Interest LevelGrades 3-6
Lexile Level880L
ATOS Level5.4
AR Points1
AR Quiz #175250
Text TypeInformational Text
Text SubtypeCause & Effect
PublisherCapstone Press
Page Dimensions6" x 9"
Page Count48
BindingReinforced Library Binding
List Price: $29.99 School/Library Price

Sets that include this title:


Nonfiction Notes from the Horn Book

"This timely discussion of our solar system’s dwarf planets focuses not just on characteristics of these astronomical bodies, but also on the scientific processes of discovery and the deliberations held by astronomers to set guidelines for categorizing space objects. High-quality photographs of the planets and bodies described, plus artistic interpretations of some of their surfaces, illustrate their major features." - Nonfiction Notes from the Horn Book

January 23, 2017

Planetary Society - Emily Lakdawalla

"The text is great; the book does an excellent job of explaining the formation of the solar system and the history of the discovery of Ceres and the asteroid belt and later Pluto and the Kuiper belt and how each step in understanding made scientists reexamine what they thought the solar system was." - Planetary Society

November 24, 2015

Steve Kortenkamp

Steve Kortenkamp

Dr. Stephen Kortenkamp is a professional astronomer who studies small solar system objects like asteroids, comets, and moons. His research also involves the formation of planets, both in our solar system and around other stars. Dr. Kortenkamp is a Senior Research Scientist at the Planetary Science Institute ( in Tucson, Arizona. His research is supported with grants from NASA and the National Science Foundation. He also teaches planetary science at the University of Arizona and in 2011 won the prestigious "Innovations in Teaching" award from the College of Science. Through the Planetary Science Institute, Dr. Kortenkamp conducts training and continuing education workshops for elementary and middle school science teachers in southern Arizona. He has written more than 20 children's books about topics related to space and has served as a scientific consultant on more than a dozen others. Steve's wife Jane is also a professional astronomer and together they have three young children. When they are not star-gazing, Steve and Jane are competitive endurance athletes who race in Ironman triathlons, marathons, and open-water swims.

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