What Do You Know?
 
  01
How many stars are there in the Milky Way Galaxy?
 
A: 200,000
B: 200 million
C: 200 billion
 
  02
Most stars form in tightly packed groups called:
 
A: star clusters
B: star huddles
C: star formations
 
  03
A star's mass is the most important thing that determines:
 
A: its temperature, luminosity, and color
B: how it will live and die
C: all of the above
 
  04
How do most stars end their lives?
 
A: The outer layer swells, and the star becomes a red giant.
B: The core shrinks, and the star becomes a white dwarf.
C: First a, then b.
 
  05
At the end of its life, a very massive star will run out of fuel and explode as a:
 
A: superstar
B: supernova
C: superbang
 
  06
How does our star, the Sun, compare to other stars?
 
A: more massive than average
B: close to average
C: less massive than average
 
  07
The Sun contains what percentage of the Solar System's mass?
 
A: 8.96%
B: 68.9%
C: 98.6%
 
  08
About how long does the Sun's light take to reach Earth?
 
A: 8 minutes
B: 8 hours
C: 8 months
 
  09
How long does it take our Solar System to orbit the center of the Milky Way Galaxy?
 
A: 25,000 years
B: 250,000 years
C: 250 million years
 
  10
Around the world today, astronomers observe stars using telescopes:
 
A: on Earth
B: in space
C: on Earth and in space
   

Check your answers