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Galaxies
  • 1. A group of stars, gas and dust held together by gravity is called a ____.
A) galaxy
B) pulsar
C) nebula
D) cluster
  • 2. A group of over 1000 galaxies is called a ____.
A) rich cluster
B) poor cluster
C) tiny cluster
D) really big cluster
  • 3. A group of less than 1000 galaxies is called a ____.
A) poor cluster
B) really small cluster
C) rich cluster
D) introverted cluster
  • 4. A galaxy with very bright centers and little or no dust is called a(n) ____ galaxy.
A) elliptical
B) spiral
C) irregular
D) normal
  • 5. A galaxy that has arms curved outward from a central point is called a(n) ____ galaxy.
A) elliptical
B) irregular
C) spiral
D) normal
  • 6. A galaxy that is distorted and comes in different sizes is called a(n) ____ galaxy.
A) elliptical
B) irregular
C) spiral
D) normal
  • 7. Which of the following is not found in galaxies?
A) Doppler radiation
B) star clusters
C) quasars
D) gas clouds
  • 8. The Milky Way is probably a(n) ____ galaxy.
A) irregular
B) dwarf elliptical
C) barred spiral
D) elliptical
  • 9. If a star is moving towards the earth, the dark lines of its spectrum more towards the ____ part of the spectrum.
A) yellow
B) red
C) blue
D) green
  • 10. If a star is moving away from the earth, the dark lines of its spectrum more towards the ____ part of the spectrum.
A) yellow
B) blue
C) green
D) red
  • 11. A constellation is ____.
A) a star system with more than two stars
B) a group of stars that appear to form a pattern
C) an open cluster of stars that are close to one another
D) two stars that orbit each other
  • 12. Hubble's Law states that ____.
A) as a source of light moves, its wavelength changes
B) the universe is actually contracting
C) the universe is expanding in all directions at the same speed
D) light from older stars undergoes a red shift
  • 13. The universe started with an event some people call the ____.
A) cosmic initiation
B) supernova
C) spiral expansion
D) big bang
  • 14. The four fundamental forces of nature are gravity, electromagnetic radiation, strong nuclear force and ____.
A) weak nuclear force
B) bottom quark
C) gluon's
D) quantum baryons
  • 15. When a dying star explodes, the ____ elements created by fusion are blown into space to be recycled by newly forming stars
A) heavier
B) hydrogen
C) lighter
D) larger
  • 16. Cosmic Background Radiation refers to a faint ____ glow that is the same in all directions.
A) Doppler redshift
B) infrared radiation
C) foreground ultraviolet
D) background radiation
  • 17. What holds planets, stars, gas, and dust together in a galaxy?
A) friction
B) inertia
C) forces
D) gravity
  • 18. Which of the three types of galaxies occur the most often?
A) they occur in equal numbers
B) spiral
C) irregular
D) elliptical
  • 19. By studying a star's spectrum, astronomers can determine ____ found in the star's atmosphere.
A) dust
B) vapors
C) gases
D) elements
  • 20. All of the following are true of the Milky Way EXCEPT that it ____.
A) is a spiral galaxy
B) is 100,000 light years across
C) has more than 500 billion stars
D) is a member of the Local Group
  • 21. A ____ is an object so dense that nothing, including light, can escape its gravity field.
A) neutron star
B) super giant
C) black hole
D) supernova
  • 22. All stars in the universe ____.
A) are the same temperature
B) produce some sort of energy
C) were formed at the same time
D) are solid like planets
  • 23. A light year is a measure of ____.
A) time
B) distance
C) wavelength fluctuations
D) speed
  • 24. What types of galaxies spin?
A) irregular
B) None of them spin.
C) elliptical
D) spiral
  • 25. What type of galaxy is the smallest?
A) They are all the same size.
B) spiral
C) irregular
D) elliptical
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