⚙️ how
How do astronomers determine the shape of a galaxy’s halo?
Quick Answer
They track stars, globular clusters, gas, and dark matter signals extending far beyond the visible disk. These measurements show the halo is much larger than the bright parts of the galaxy.
The Full Story
A galaxy’s halo is the extended region surrounding its main disk and bulge. Astronomers map it using fast-moving halo stars, globular clusters, and gravitational lensing that reveals dark matter distribution. The halo can be spherical or flattened depending on the galaxy and its history of mergers. In the Milky Way, the halo contains old stars and a large share of the galaxy’s mass in dark matter.
Key Facts
1.Halos extend beyond the visible disk
2.They contain old stars and dark matter
3.Lensing and star motions help map them
YouTube Angle
Suggested video title for this topic:
"What lies beyond the bright edge of a galaxy?"
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