star formation occurs in molecular clouds, which consist mainly of molecular hydrogen H_2 and Helium He. These clouds are located in the plane of spiral galaxies (like our own), or in irregular galaxies (e.g. the Magellanic clouds).
When a shock wave passes through a molecular cloud, the densest parts will become gravitationally unstable and will eventually collapse, triggering the star formation process. On a large scale, the shock wave is created by a density wave propagating through the disk of the galaxy. This is at the origin of the beautiful spiral arms we observe in some galaxies.
2007-01-24 10:37:29
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answer #1
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answered by Anonymous
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In Huge Huge hydrogen and helium Clouds ,called star nurseries
2007-01-24 12:13:26
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answer #2
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answered by Anonymous
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in star forming regions or nebulae
2007-01-24 09:23:13
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answer #3
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answered by Belru Tytor 2
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by the hand of God.
2007-01-24 07:42:18
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answer #4
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answered by Anonymous
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