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Understanding Galaxies (Grade 7)

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Understanding Galaxies

1. 
There are three main types of galaxies.
  1. True
  2. False
2. 
An irregular galaxy contains young, bright stars.
  1. True
  2. False
3. 
On a clear night, part of the Milky Way Galaxy can be seen as a faint band of light in the sky.
  1. True
  2. False
4. 
What is a galaxy?
  1. a large group of stars held together by gravity
  2. a system of planets and its moons
  3. a system of planets orbiting a star
  4. a group of comets
5. 
In the 1920s,                showed that other galaxies exist besides our own.
  1. Sally Ride
  2. Don Winget
  3. Jocelyn Bell
  4. Edwin Hubble
6. 
How do astronomers classify galaxies?
  1. by size
  2. by shape
  3. by distance from sun
  4. by location in the sky
  5. by symmetry
  6. by light years
7. 
Which put the following in order from biggest to smallest?
  1. Galaxy, Universe, Solar System, Star, Planet
  2. Universe, Solar System, Galaxy, Planet, Star
  3. Solar System, Universe, Galaxy, Star, Planet
  4. Universe, Galaxy, Solar System, Star, Planet
8. 
Complete the sentence.

Gravitational forces cause                        to orbit planets, planets to orbit                       , and stars to orbit the centers of                       .
  1. moons; stars; galaxies
  2. galaxies; stars; moons
  3. moons; galaxies; stars
  4. stars; moons; galaxies
9. 
Which is not a type of galaxy?
  1. spiral
  2. elliptical
  3. regular
  4. irregular
10. 
Why are elliptical galaxies brighter toward the center?
  1. The stars are evenly distributed through the galaxy.
  2. The center is crowded with stars, and the number of stars decreases farther out.
  3. Most stars are near the outside of the elliptical galaxy, with dust clouds in the center.
  4. The stars are spread through out the galaxy in bands that look like the arms of spiral galaxies.
11. 
What term do astronomers use to describe a galaxy that has a jumbled scattering of stars?
  1. barred spiral galaxy
  2. elliptical galaxy
  3. irregular galaxy
  4. spiral galaxy
12. 
What galaxy shape is the Milky Way?
  1. irregular
  2. lenticular
  3. barred spiral
  4. elliptical
13. 
When up to 50 galaxies are bound to each other by gravity, they are called a                .
  1. group
  2. cluster
  3. collective
  4. supercluster
14. 
Why do galaxies appear to move away from each other?
  1. Galaxies are spinning.
  2. The universe is expanding.
  3. Others move closer together.
  4. Stars still are being born.
15. 
What is the relationship of the Milky Way to the Local Group?



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