Halo
A typical spiral galaxy has a faint, extended stellar halo.
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.
Halo (optical phenomenon)
Halo around the sun at the South Pole (NOAA) ...
Halo
A ring of light around a bright object as seen through a mist.
, , ...
Halo Crater
A bright halo impact with fresh is visible here. Behind the crater is bright grooved terrain, which may be the result of of surface materials along planes.
Dark matter halo
Wikipedia, the free encyclopedia - Cite This Source ...
Halo
(a) Nebulous quality round a celestial body (particularly round a red giant); the galactic halo, however, describes the spherical collection of stars forming a surrounding "shell" for our otherwise compact, discoid Galaxy.
halo
the outer region of a galaxy; contains globular clusters, a few stray stars, and dark matter
heliacal rising ...
Halo: The spherical region of a spiral galaxy composed of diffuse gas an$containing few stars and star clusters.
Halo orbit -- A spacecraft's pattern of controlled drift about an unstable Lagrange point (L1 or L2 for example) while in orbit about the primary body (e.g. the Sun).
HEF -- DSN's high-efficiency 34-m DSS, replaces STD DSSs.
Halo
The spherical region of a spiral galaxy containing a thin scattering of stars, star clusters, and small amounts of gas.
Head-Tail Radio Galaxy ...
Halo is a science fiction video game franchise, created by Bungie and owned and published by Microsoft Game Studios.
Halo, galactic. A roughly spherical shaped region around the main part of the Galaxy.
Heliocentric. Meaning: As seen from the centre of the Sun. A system of co-ordinates.
Halo
The galactic disk is surrounded by a spheroid halo of old stars and globular clusters, of which 90% lie within 100,000 light-years, suggesting a stellar halo diameter of 200,000 light-years.
Halo
This one is pretty simple - this is the region around the galaxy where you find globular clusters. It is actually a large, spherical region that surrounds the galaxy's disk.
the halo
There is an older stellar population in a spherical distribution around our galaxy. We call this the halo. The amount of mass in the halo is several orders of magnitude less than in the disk.
CORE"HALO RADIO GALAXIES
One common type of radio galaxy is often called a core"halo radio galaxy. As illustrated in Figure 25.
DARK HALO - Extended region surrounding a galaxy containing globular clusters and other old stars. The halo has considerable mass but relatively low luminosity, suggesting it contains a lot of dark matter.
[edit] Halo stars
See also: Galactic halo
High-velocity stars are very old stars that do not share the motion of the Sun or most other stars in the solar neighbourhood which are in similar circular orbits around the centre of the Galaxy.
HALO
A halo is a luminous ring that is sometimes seen surrounding the sun or the moon. Some parts of the halo are very bright, others are not very bright. Sometimes, only a part of the ring is visible.
Halo stars are distributed somewhat spherically around the galactic core but most members of the halo lie far above or far below the galactic plane.
Halo material is enhanced in false color.
JUPITER'S GOSSAMER RING
The extremely diffuse gossamer ring which lies outside the main ring.
halo
(1) A luminous ring seen around the Moon or Sun, caused by the refraction of light through high clouds. (2) A ring of old stars which surround the Milky Way in halo fashion
interstellar space ...
halo - (n.)
(a) The extended outer portions far above and below the plane of a galaxy such as the Milky Way.
Halo, Galactic: An extended region surrounding a galaxy. The halo contains globular clusters and other old stars.
The halo stars are metal-poor (0.001 to 0.03 times solar abundance), but the abundance increases inward toward the center. The bulge stars have metal abundances of 1 to 3 times that of the Sun.
Gas Halo Around Ordinary Spiral Galaxy
(Added 08/15/06) Scientists using NASA's Chandra X-ray Observatory have detected an extensive halo of hot gas around a quiescent spiral galaxy.
see Halo [C95]
Stellar Parallax
see Parallax [C95]
Stellar Population ...
dark halo A large envelope of dark matter around a galaxy that is postulated to explain the rapid rotation of galaxies and other observations.
LUNAR HALO
A lunar halo is a luminous ring that is sometimes seen surrounding the moon. Some parts of the halo are very bright, others are not very bright. Sometimes, only a part of the ring is visible.
SOHO - Halo Mass Ejection Event.
SOHO - Halo Mass Ejection Event - Zoomed Out.
SOHO - Explosive Coronal Mass Ejections from the Sun.
SOHO-6 Comet at 2-6 solar radii from the Sun.
Solar Magnetic Field Map
Man's Fascination of the Sun.
Galactic Halo
Spherical regions around spiral galaxies that contain dim stars and globular clusters. The radius of the halo surrounding the Milky Way extends some 50,000 light-years from the galactic center.
Galactic Nucleus ...
galactic halo
A spherical region surrounding the center of a galaxy. This region may extend beyond the luminous boundaries of the galaxy and contain a significant fraction of the galaxy's mass.
Galactic Halo
The name given to the spherical region surrounding the center, or nucleus of a galaxy.
Galactic Halo - The roughly spherical outermost component of the Milky Way, reaching to at least 30 to 40 kiloparsecs (kpc) from the center
Galactic Latitude - The angular distance of a body above or below the galactic equator ...
galactic halo
The circular region surrounding the disk of a spiral galaxy. The halo is thin and is composed mostly of old globular clusters.
Massive Compact Halo Objects. Low-luminosity objects such as planets and brown dwarfs which contribute to the mass of the galactic halo.
Magellanic clouds
Small, irregular galaxies that are companions to the Milky Way. Visible in the southern sky.
The dark matter halo that surrounds the Milky Way Galaxy, making up 70 percent of its mass, appears to be shaped like a squashed ball, according to new findings presented today at the meeting of the American Astronomical Society in Washington, DC.
MACHOs (NASA Thesaurus) See massive compact halo objects. Maclaurin series (NASA SP-7, 1965) See Taylor theorem. macroscopic (NASA SP-7, 1965) Large enough to be visible to the naked eye or under low order of magnification.
The term perihelion should not be confused with parhelion, a form of halo. period 1. The interval needed to complete a cycle. 2. = orbital period. 3.
globular cluster Gravitationally-bound spherical clusters of densely-packed stars, normal found in the halo of galaxies. Globular clusters contain thousands of stars, maybe up to a million.
1918 - Harlow Shapley demonstrates that globular clusters are arranged in an spheroid or halo whose center is not the Earth, decides, correctly, that its center is the center of the galaxy, ...
halo, atmospheric
halo, galactic
halo population
H-alpha
Hamal (Alpha Arietis)
Haro galaxy
HARPS (High Accuracy Radial Velocity Planetary Search)
Hartmann test
Harvard College Observatory
Harvard Revised Photometry (HR Photometry) Catalogue ...
This is the galactic halo. Its existence is known through two effects: the observation of old, high-velocity stars that are passing through the galactic plane, ...
Neutrinos would be hot unless their rest mass is higher than experiment now indicates, and the often-hypothesized weakly interacting massive particles (WIMPs, as contrasted to MACHOS = massive compact halo objects) and other baryonic forms would be ...
It then appears as a halo of light with an irregular outer edge, often with streamers radiating from the sun's surface and contrasting with the dark lunar disk that it borders.
It is surrounded by a larger cloud of hydrogen gas, warped and scalloped at its edges, and surrounding this in turn is a spheroidal or somewhat flattened halo that contains many separate, ...
The latter (formerly designated 1983TB) exhibits none of the usual cometary features, a nebulous halo and tail; it simply looks like a small Earth-crossing asteroid.
Surrounding the inner lobes is a huge halo that seems illuminated by the ultraviolet light that sneaks out through the lane. On the right is the highly detailed Hubble view (rotate it about 40 degrees to the right to match Curtis's photo).
Al igual que otras galaxias espirales, la Vía Láctea tiene una protuberancia, un disco, y un halo. Aún cuando todas son partes de la misma galaxia, cada una contiene diferentes objetos.
Surrounding the whole system, and outside the plane of the disk is the galactic halo. This is where the globular clusters live. As we have discussed previously, the globular clusters are composed of old Population II (metal poor) stars.
Most dark-matter searches have focused on our galaxy's halo -- a sphere around the flat, main disk, like the halo seen in blue around the edge-on spiral galaxy NGC 4361 (at right, top).
So-called "halo events" are coronal mass ejections moving almost directly toward Earth. As they loom larger and larger, they appear to envelope the Sun, forming a halo around our star.
The Hubble's spherical aberration spread a star's light out into a fuzzy halo four arc seconds across.
It was inserted into a halo orbit around the L1 Lagrangian point between the Earth and Sun in February 1996.
It produced a "halo event" in which the entire Sun appeared to be surrounded by the CME. Halo events are produced by CMEs that are directed toward the Earth. As they loom larger and larger they appear to envelope the Sun itself.
The disk and the bulge are surrounded by the galactic halo, which is spherical and even larger than the galactic disk. The halo consists of old stars, some in the globular clusters, and interstellar matter.
Outside the nuclear bulge and disk is a sparse, more or less spherical halo of star clusters, individual stars, and perhaps other matter. The halo may extend far beyond the disk and contain most of the galaxy's mass.
Some believe that it may be normal objects such as cold gasses, dark galaxies, or massive compact halo objects (called MACHOs, they would include black holes and brown dwarfs).
[6.2] LIBRATION POINTS, HALO ORBITS, & MANIFOLDS
[6.3] UNCERTAINTY IN ORBITAL MECHANICS / THE BUTTERFLY EFFECT
[6.4] FOOTNOTE: LARRY NIVEN'S INTEGRAL TREES / SPACE TETHERS ...
Later in the mission, the Wind spacecraft will be inserted into a special halo orbit in the solar wind upstream from the Earth, at the unique distance which allows Wind to always remain between the Earth and the Sun (about 930,000 to 1,050,000 miles, ...
 See also: Light, Sun, Solar, Galaxy, Earth
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