Chapter 22 - The Milky Way
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Created by:
chip_bonar on May 30, 2012
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9 terms
Terms | Definitions |
|---|---|
 dark matter | type of matter that has been detected only by its gravitational effects on ordinary matter |
| dark nebulae | nebulae that con be observed when they block the light from more distant stars or nebulae |
| galactic disk | an immense, circular, flattened region containing most of our galaxy's luminous stars and interstellar matter |
| HII region | a cloud of ionized hydrogen formed when young stars heat the surrounding gas |
| interstellar matter | the gas and dust located between the stars in a galaxy |
| kiloparsec | A distance equal to 1000 parsecs. |
| reflection nebula | An interstellar cloud in which the dust particles reflect starlight, making the cloud visible. |
| Sgr A | It is a complex radio source at the center of the Milky Way Galaxy. It stands for Sagittarius A. |
| spiral arm | Long, spiral pattern of bright stars, star clusters, gas and dust that extends from the center to the edge of the disk of spiral galaxies |
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