Question

What holds the stars of the galactic disk in orbit around the galactic center?

*could be multiple answers

	Kepler ’ s 3rd law
	The collective gravitational attraction from other stars and gas
	Self-propagating star formation
	Dark matter
	The density waves in the Milky Way
	The rotation of the Milky Way

Answer 1

Since, We know that our galaxy rotation is happening because the Milky Way is a flattened disk, in the same way that the Solar System is a flattened disk. The centrifugal force from the rotation flattens out the galactic disk. All stars in the galactic disk follow roughly circular orbits around the center of the galaxy. Stars in the halo can have much different orbits and speeds.

Therefore, the most appropriate answer is. . The rotation of the Milky Way.... .

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