What is the main idea?
Pluto is smaller than Earth's Moon
Astronomers are scientists who study space.
Pluto used to be considered a planet.
We have eight planets.
What detail best supports the main idea?
Astronomers are scientists.
In 2006, scientists announced that Pluto would be considered a dwarf planet.
Pluto has three moons.
Planets are part of the solar system.
What would be another good title for this passage?
Astronomers
Our Solar System
Space
The Dwarf Planet
