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Creation of Spiral and Elliptical Galaxies

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Creation of Spiral and Elliptical Galaxies
A galaxy begins as a huge cloud of primordial gas that collapses gravitationally.
(a) If the rate of star birth is low, then much of the gas collapses to form a
disk, and a spiral galaxy is created. (b) If the rate of star birth is high, then the
gas is converted into stars before a disk can form, resulting in an elliptical
galaxy.
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