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Understanding Galaxies (Grade 7)

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Understanding Galaxies

There are three main types of galaxies.
  1. True
  2. False
An irregular galaxy contains only young, bright stars.
  1. True
  2. False
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
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
In the 1920s,                showed that other galaxies exist besides our own.
  1. Sally Ride
  2. Don Winget
  3. Jocelyn Bell
  4. Edwin Hubble
How do astronomers classify galaxies? Select all that are correct.
  1. by size
  2. by shape
  3. by distance from Sun
  4. by location in the sky
  5. by symmetry
  6. by light-years
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
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
Which is not a type of galaxy?
  1. spiral
  2. elliptical
  3. regular
  4. irregular
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.
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
What galaxy shape is the Milky Way?
  1. irregular
  2. lenticular
  3. barred spiral
  4. elliptical
When up to 50 galaxies are bound to each other by gravity, they are called a                .
  1. group
  2. cluster
  3. collective
  4. supercluster
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.
What is the relationship of the Milky Way to the Local Group?

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