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Ch 2 Lesson 3 Star, Galaxies and the Universe

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  • What is a supercluster?
    A supercluster is the Local Group + other stars, gases, and dust.
  • Give 3 characteristics of stars.
    sphere shaped, very hot, made up of burning gases
  • The distance from Earth to the Sun is called
    One astronomical unit
  • Irregular galaxies are (shaped like footballs or oddly shaped)
    oddly shaped
  • True or False: Elliptical galaxies contain older, redder stars.
    True
  • How is the distance between stars measured?
    in light years
  • True or false: Spiral shaped galaxies contain young, blue stars in their central bulges.
    False: Older, redder stars are in their central bulge; young stars are in their arms.
  • True or False: The Sun is a yellow star.
    True
  • Explain the Big Bang Theory.
    The universe formed from a single point and is still expanding.
  • Define galaxy.
    A galaxy is a huge collection of stars, gases and dust that is classified by shape.
  • The Local Group is a (cluster or supercluster) made up of 30 galaxies.
    cluster
  • Our Sun is (an ordinary color or very massive) compared to most other stars
    very massive
  • True or False: Irregular galaxies have many young stars.
    True
  • Earth is located (near the center or in one of the arms) of the Milky Way galaxy.
    in one of the arms
  • What is the name of the galaxy we are located in?
    The Milky Way Galaxy
  • The distance light travels in one year is called
    light year
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