Question

Why is Pluto now called a dwarf planet?

Answer 1

Answer:

In 2003, astronomers discovered a new object beyond Pluto that they named Eris. That discovery caused astronomers to talk about the defining characteristics of a planet. They decided that because of its size and location, Pluto, along with Eris, were not planets. Pluto, Eris, and objects like them are now classified as dwarf planets.

Explanation:

Answer 2

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.