The Sun — Unit test

Question 1

What is the Milky Way?

Revolt · Accepted Answer

a spiral galaxy in which Earth is located

Question 2

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

Revolt · Accepted Answer

24,000,000,000 km

Question 3

About how old is the Sun?

Revolt · Accepted Answer

4.6 billion years

Question 4

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

Revolt · Accepted Answer

solar flares.

Question 5

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?

Revolt · Accepted Answer

the convection zone, because it shows how energy moves in a convection current

Question 6

Which is one physical property that all stars have?

Revolt · Accepted Answer

They are made of gases.

Question 7

Which quantity does a light-year measure?

Revolt · Accepted Answer

distance

Question 8

Observable matter makes up about what percentage of the universe?

Revolt · Accepted Answer

5%

Question 9

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

Revolt · Accepted Answer

background radiation

Question 10

Which term defines a star system with two stars?

Revolt · Accepted Answer

binary star system

The Sun — Unit test Answers