Conservation of angular momentum (Unit 20) requires that the
product of the speed at which an object is orbiting times the distance from the
point around which it is orbiting remain constant. If the Sun is currently
orbiting at 220 km/sec, 8 kpc from the center of the Milky Way, how fast did
the material that formed the Sun rotate if the gas began 400 kpc distant (about
halfway to the next large galaxy)?
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