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. The roughly spherical halo of the Milky Way is thought to have a galactic halo | astronomy | Britannica BrowseSearch
Evidence suggests that the formation of galactic halos may also be due to the effects of increased gravity and the presence of primordial black holes. The gas from halo mergers goes toward the formation of the central galactic components, while stars and dark matter remain in the galactic halo.
Several distinct components of galaxies comprise the halo: the stellar halo. the galactic corona (hot gas, i.e. a plasma) the dark matter halo.
A halo can be studied by observing its effect on the passage of light from distant bright objects like quasars that are in line of sight beyond the galaxy in question. The stellar halo is a nearly spherical population of field stars and globular clusters. It surrounds most disk galaxies as well as some elliptical galaxies of type cD.
Why has star formation ceased in the galactic halo? All of the galaxy's cool gas settled to the galactic plane long ago.
Halo stars stand out because they formed before supernova explosions had scattered a large amount of heavy elements into the galaxy, so halo stars possess little iron.
Where does most star formation occur in the Milky Way galaxy today? In the spiral arms.
Stars in the inner halo were born during the assembly process. Over time, the Milky Way gobbled up older dwarf galaxies that formed less than 2 billion years after the big bang. Their ancient stars settled into the outskirts of the halo, creating the outer halo.
Which of these objects have not been found in the Galactic Halo? barred spiral galaxy. Which is the correct description for the Sun's location in the Galaxy?
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.
Much of the star formation in the disk happens in the spiral arms. Spiral arms are waves of star formation. Spiral arms are waves of star formation. 1.
The three components are the disk (there is a thin and a thick disk), bulge and halo.
Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born. The existing stars inside an elliptical galaxy tend to be older, giving off more red light than younger stars.
Galactic Halo: a spherical halo of old stars and clusters. Spiral galaxy: Our galaxy.
The halo is home to some ancient star clusters, known as globular clusters. They are known to be old because their stars contain low levels of heavy elements, which weren't present in the young universe and were built up over time in supernovae. The clusters move about the galactic nucleus in (nearly) random orbits.
Galactic halo. Region of a galaxy extending far above and below the galactic disk, where globular clusters and other old stars reside. - Roughly spherical- mildly flattened. - Contains old stars only. - contains no gas and dust.
The orbits of stars in the center of the galaxy indicate that the presence of 3 to 4 million solar mass object in a region no larger than our Solar System.
The older the star, the lower its abundance of heavy elements.
Active galactic nuclei tend to become less active as they age.
A. True, starburst galaxies are the most prolific regions of star formation in the universe.
B. Gravity of disk stars pulls them toward the disk.
C. Halo stars knock them back into the disk.
D. False, starburst galaxies are only found nearby, and are all very young.
Galactic halo, in astronomy, nearly spherical volume of thinly scattered stars, globular clusters of stars, and tenuous gas observed surrounding ...
Milky Way Galaxy: 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…. Milky Way Galaxy.
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.
Milky Way Galaxy. Milky Way Galaxy, large spiral system consisting of several hundred billion stars, one of which is the Sun. It takes its name from the Milky Way, the irregular luminous band of stars and gas clouds that stretches across the sky as seen from Earth. Although Earth lies well within the….
The roughly spherical halo of the Milky Way is thought to have a radius of some 50,000 light-years (about 5 × 10 17 kilometres), and its gas is a source of radio emission, particularly at the 21-centimetre wavelength ( see 21-centimetre radiation ). Read More on This Topic. Milky Way Galaxy: The massive halo.