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Sci. 4-3 Galaxies

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Sci. 4-3 Galaxies Pages 110-113 A. Galaxies- large groupings of stars in space held together by the attraction of gravity B. Edwin Hubble classified galaxies ... – PowerPoint PPT presentation

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Title: Sci. 4-3 Galaxies


1
Sci. 4-3 Galaxies Pages 110-113
2
A. Galaxies- large groupings of stars in space
held together by the attraction of gravity
3
B. Edwin Hubble classified galaxies according to
their shape. Major types include spiral,
elliptical, and irregular galaxies.
4
1) Spiral galaxies- have a bulge at the center
and very distinct spiral arms, a) Most galaxies
are this type of galaxy.
5
b) The Milky Way is a spiral galaxy.
6
  • Elliptical Galaxies- massive blob of stars shaped
    from sphere shape to cucumber shape
  • a) only contains old stars

7
  • Irregular Galaxies- galaxies that dont fit into
    the other classes.
  • a) Many of these galaxies may have their shape
    distorted by neighboring galaxies gravity.

8
  • Nebula- giant clouds of gas and dust
  • 1) Some nebulas are regions where new stars are
    formed from gas and dust

9
D. Globular Cluster- groups of older stars that
look like a ball of stars 1) Globular stars
clusters are found in the halos of spiral
galaxies and in elliptical galaxies.
10
E. Open Clusters- groups of stars that are
usually located along the spiral disk of a galaxy.
11
  • Origin of Galaxies
  • 1) Because light travels at a certain speed,
    observing distant galaxies is looking back in
    time. Scientists look at distant galaxies to
    learn what early galaxies look like.

12
  • Quasars- a starlike source of light that is
    extremely far away
  • 1) Quasar may be the earliest types of galaxies
    ever formed
  • 2) Quasar may have enormous black holes at their
    center
  • 3) Quasars are among the most powerful energy
    sources in the universe.
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