AST-514intermediate

Milky Way Rotation & Dark Matter: Observation, Measurement & Evidence

The rotation of the Milky Way shows that visible stars and gas do not account for all of its gravitational mass. Milky Way dynamics constrain dark-matter halo shape and density, determine the Galaxy's total mass, and set the gravitational environment for stellar streams, satellites, and Solar-System motion through the Galaxy.

Review statusgreen

Review cycle365 days

Last reviewedNot yet

Start lesson See what connects to this

Learn this concept

Turn the idea into understanding.

1 published lesson

intermediate48 minFact checked

Milky Way Rotation & Dark Matter: Observation, Measurement & Evidence

Open the full lesson, review the evidence, and complete the knowledge check.

Knowledge map

See where this idea fits.

←

Before this

Prerequisites

AST-513Milky Way Rotation & Dark Matter: Physical Mechanisms→

→

After this

Builds toward

AST-515Milky Way Rotation & Dark Matter: Advanced Connections→

Evidence first

Verified knowledge behind the lesson.

How verification works →

The rotation of the Milky Way shows that visible stars and gas do not account for all of its gravitational mass.

supported

For a nearly spherical mass distribution, orbital speed depends on the mass enclosed within the orbit.

supported

Measurements of neutral hydrogen, molecular masers, stellar velocities, satellite motions, and local stellar dynamics all require more gravitating mass than can be supplied by observed baryonic matter alone.