Which did you include in your answer? Check all that apply.

Question

Revolt · Accepted Answer

In 2003, astronomers discovered Eris.; The discovery of Eris caused astronomers to talk about the defining characteristics of a planet.; Because Pluto has not cleared its orbit, it is not considered to be a planet.; Pluto, Eris, and other objects like them are now classified as dwarf planets.

The Earth-Sun-Moon System

Which did you include in your answer? Check all that apply.

More from this Course