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