Black Holes

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Black Holes
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Black Holes

• The intense gravitational field left when a giant
  star collapses

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• It is called a black hole because not even light
  can escape

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Photon Sphere

• The outer edge where light bends but is still
  escapable

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Event Horizon

• The point at which no light can escape

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Singularity

• The shrunken star too small to be measured but
  with indefinite density

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Galaxies
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Galaxy

• A large assembly of stars and nebulae

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Group of Galaxies
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The Milky Way

• Our galaxy
• Flat disk with spiral arms

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Three Types of Galaxies
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Elliptical

• Oval shaped
• Most common type of galaxy found

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• Contains little gas and dust
• Most are dim and difficult to see

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Spiral

• Dense center with spiral arms
• Bright and easy to see

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• Contains large amounts of gas and dust always
  producing new stars

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Irregular

• No specific shape
• Contains large amounts of gas and dust

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• Small and faint therefore hard to see

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Quasars
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Quasars

• Small, powerful source of energy thought to be
  cores of distant spiral galaxies

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• They emit radio waves and bright light

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