( )1. It always goes around the star.
A. a planet
B. the sun
C. a moon
( )2. It’s the coldest planet in the solar system.
Mars
Earth
Neptune
How many planets are there in the solar system?
7
8
9
This is the closest planet to the sun in the solar system.
A. Earth
Venus
Mercury
The night sky is full of these.
planets
stars
moons