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A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component. [1] Several distinct components of a galaxy comprise its halo: [2] [3] the stellar halo; the galactic corona (hot gas, i.e. a plasma) the dark matter halo
Galactic halo, in astronomy, nearly spherical volume of thinly scattered stars, globular clusters of stars, and tenuous gas observed surrounding spiral galaxies, including the Milky Way—the galaxy in which the Earth is located.
Galaxies are surrounded by a nearly spherical region of scattered stars known as Galactic Halo. A halo is a massive component of a galaxy that is several times greater than the mass of the rest of the galaxy. It can extend beyond a distance of 100,000 light years from the center.
The Milky Way's stellar halo is the visible portion of what is more broadly called the galactic halo. This galactic halo is dominated by invisible dark matter, whose presence is only measurable through the gravity that it exerts.
The massive halo. The least-understood component of the Galaxy is the giant massive halo that is exterior to the entire visible part. The existence of the massive halo is demonstrated by its effect on the outer rotation curve of the Galaxy (see below Mass). All that can be said with any certainty is that the halo extends considerably beyond a ...
Beyond the central disk lies something called the galactic halo, which surrounds most galaxies. This galactic halo is roughly spherical and doesn’t have a hard edge. Instead, it just gently fades...
The Milky Way’s stellar halo is the visible portion of what is more broadly called the galactic halo. This galactic halo is dominated by invisible dark matter, whose presence is only measurable through the gravity that it exerts. Every galaxy has its own halo of dark matter.
The most massive part of the Milky Way and any galaxy is the halo, which is a roughly spherical region surrounding the galactic disk. This halo consists of two parts, which may or may not be related.
A stellar halo is an essentially spherical population of stars and globular clusters thought to surround most disk galaxies and the cD class of elliptical galaxies. Only about 1% of a galaxy’s stellar mass resides in its halo, and due to this low luminosity, the observation of halos in other galaxies is extremely difficult.
MIT researchers, including several undergraduate students, have discovered three of the oldest stars in the universe, and they happen to live in our own galactic neighborhood. The team spotted the stars in the Milky Way’s “halo” — the cloud of stars that envelopes the entire main galactic disk.