black holes
TRANSCRIPT
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Black Holes
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Black HolesThe 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 HorizonThe point at which no light can escape
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SingularityThe shrunken star too small to be measured but with indefinite density
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Galaxies
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GalaxyA large assembly of stars and nebulae
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Group of Galaxies
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The Milky WayOur galaxyFlat disk with spiral arms
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Three Types of Galaxies
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EllipticalOval shapedMost common type of galaxy found
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Contains little gas and dustMost are dim and difficult to see
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Spiral Dense center with spiral armsBright and easy to see
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Contains large amounts of gas and dust – always producing new stars
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IrregularNo specific shapeContains 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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QuasarsSmall, 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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