Larger1 - Larger-scale structures Deep sky surveys show...

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Larger-scale structures Deep sky surveys show that galaxies are often found in relatively close association with other galaxies. Solitary galaxies that have not significantly interacted with another galaxy of comparable mass during the past billion years are relatively scarce. Only about 5% of the galaxies surveyed have been found to be truly isolated; however, these isolated formations may have interacted and even merged with other galaxies in the past, and may still be orbited by smaller, satellite galaxies. Isolated galaxies [note 2] can produce stars at a higher rate than normal, as their gas is not being stripped by other nearby galaxies. [102] On the largest scale, the universe is continually expanding, resulting in an average increase in the separation between individual galaxies (see Hubble's law ). Associations of galaxies can overcome this expansion on a local scale through their mutual gravitational attraction. These associations formed early in the universe, as clumps of dark matter pulled their respective
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Larger1 - Larger-scale structures Deep sky surveys show...

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