The Earth-Sun-Moon System — Unit test Answers

The sudden eruptions of energy from a small area of the Sun’s surface are known as

Which is a type of star system?

Which quantity does a light-year measure?

Lori attended a lecture about the Sun, and the presenter had placed this image on the wall. Which layer of the Sun could this image be referring to?

Which is a factor that keeps Earth in orbit around the Sun?

Which characteristic do Mercury and Mars share?

Which remains the same as the distance of an object from Earth changes?

Why did scientists struggle for thousands of years to accurately describe the solar system?

What is the Milky Way?

Which is one physical property that all stars have?

Observable matter makes up about what percentage of the universe?

If astronomers discovered a new inner planet in the solar system, which characteristic would it most likely have?

Solar winds have an influence all the way to about 160 AU from the Sun. About how many kilometers is that?

What was discovered in 1965 and is believed to be leftover thermal energy from the big bang?

What force acts between Earth and the moon?