February 21, 2017

Homework Help: Cosmology

Posted by C on Friday, March 1, 2013 at 7:54am.

Which of the following statements is not true of spiral arms:
they tend to trail the rotation of the galaxy
they are sites of star formation
they are amplified by resonances between the epicyclic frequencies of stars and the angular frequency of the spiral pattern
they arise simply from differential rotation

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