8.8A Components of the Universe · © 2011 Rice University – All Rights Reserved 8.8A Components...
Transcript of 8.8A Components of the Universe · © 2011 Rice University – All Rights Reserved 8.8A Components...
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8.8A Components of the Universe
Picture Vocabulary
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Universe
All space and the matter space contains
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Star
A self-luminous celestial body consisting of a mass of gas held together by its own gravity in
which the energy is generated by nuclear reactions in its interior
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Nebula
Large cloud of gas and dust in interstellar space; the location of star formation
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Galaxy
A large grouping of stars in space
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Hertzsprung-Russell Diagram
A plot of the surface temperature (color) of
stars vs. their luminosity (brightness)
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Elliptical-Shaped Galaxy
A galaxy with a bright center and very little
dust or gas
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Spiral-Shaped Galaxy
A galaxy with bulge in the center and very distinct long arms winding around the center
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Lenticular-Shaped Galaxy
Galaxy with a central bulge or bar with short arms, if any are present
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Irregular-Shaped Galaxy
A galaxy that does not !t into any category; a galaxy with very little symmetry
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Black Hole
An object with more than four solar masses squeezed into a ball only 10 km across whose
gravity is so strong that even light can not escape.
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Supernova
The death of a large star by explosion
Credit: NASA