Demoting Pluto: The Discovery of Dwarf Planets

Thursday, August 24, 2017
Pluto Demoted Day
On this day in 2006, Pluto was demoted from our solar system's 9th planet down to "Dwarf Planet" by world scientists.

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.

Author Kortenkamp, Steve
Pages 48 pages
Genre Nonfiction
Reading level 3-4
Interest level 3-6
Guided reading U
ATOS 5.4
Lexile 880L