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The Milky Way disk is 100 times longer than it is thick.
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Milky and Way
Finally we go into the farthest reaches of the Milky Way ; ;
It seemed almost a magnification of the Galaxy itself, of the Milky Way, blown up by some master photographer.
The information obtained by astrometric measurements provides information on the kinematics and physical origin of our Solar System and our galaxy, the Milky Way.
Astrometry is an important step in the cosmic distance ladder because it establishes parallax distance estimates for stars in the Milky Way.
They may similarly be produced in regions like the center of the Milky Way and other galaxies, where very energetic celestial events occur ( principally the interaction of relativistic jets with the interstellar medium ).
Because it occupies a part of the celestial sphere that faces away from the Milky Way, Antlia contains very few deep-sky objects.
The Milky Way, for example, has an absolute magnitude of about − 20. 5.
Antares ( α Scorpii, α Sco, Alpha Scorpii ) is a red supergiant star in the Milky Way galaxy and the sixteenth brightest star in the nighttime sky.
These names are from the love story of, Qī Xī, in which Niú Láng and his two children, β and γ Aquilae, are separated from their mother, (, ), the star Vega, by the Milky Way.
They are only permitted to meet once a year, when the Milky Way is crossed by a bridge of magpies.
Scholars have proposed that the bridge may have originally represented the Milky Way and have noted parallels between the bridge and another bridge in Norse mythology, Gjallarbrú.
He did not grasp the cosmological implications of this fact, and indeed at the time it was highly controversial whether or not these nebulae were " island universes " outside our Milky Way.
Across the top, the Milky Way disk appears distorted into an arc.
In this way, astronomers have identified numerous stellar black hole candidates in binary systems, and established that the core of our Milky Way galaxy contains a supermassive black hole of about 4. 3 million solar masses.
The Great Rift, a series of dark patches in the Milky Way, is more visible and striking in the southern hemisphere than in the northern.
" Members of the Inca civilization identified various dark areas or dark nebulae in the Milky Way as animals, and associated their appearance with the seasonal rains.
Due to the difficulty of using these methods, they did not realize that the nebulae were actually galaxies outside our own Milky Way, nor did they speculate about the cosmological implications.
From 1869 to 1872, he was employed as an Assistant in Harvard's astronomical observatory, doing important work on determining the brightness of stars and the shape of the Milky Way.
The Coalsack Nebula is the most prominent dark nebula in the skies, easily visible to the naked eye as a prominent dark patch in the southern Milky Way.
About seven million years old, an age that makes it one of the youngest open clusters in the Milky Way, it appears to have the shape of a letter A.
It is thought of as the anchor of Tama-rereti's waka ( the Milky Way ), while the Pointers are its rope.
Cetus lies far from the galactic plane, so that many distant galaxies are visible, unobscured by dust from the Milky Way.
NGC 1502 is also associated with Kemble's Cascade, an small chain of stars 2. 5 ° long that is parallel to the Milky Way and is pointed towards Cassiopeia.
Centaurus contains several very bright stars because of its position in the Milky Way ; in addition, its alpha and beta stars are used to find the constellation Crux.
It is the largest and brightest globular cluster in the Milky Way, at ten times the size of the next-largest cluster, it has a magnitude of 3. 7.
Milky and disk
In 1750 Thomas Wright, in his An original theory or new hypothesis of the Universe, speculated ( correctly ) that Milky Way was a flattened disk of stars, and that some of the nebulae visible in the night sky might be separate Milky Ways.
Though it probably formed as a disk shape, tidal forces from the Milky Way have distorted it.
# disk-the study of the Milky Way disk ( the plane upon which most galactic objects are aligned )
* 7 E + 41 m² – roughly the area of Milky Way's galactic disk
Their gravity has affected the Milky Way as well, distorting the outer parts of the galactic disk.
For stars in the Milky Way disk, this corresponds to a mean baseline of 4 A. U. per year, while for halo stars the baseline is 40 A. U. per year.
Ross 128 is an old disk star, which means it has a low abundance of elements other than hydrogen and helium, what astronomers term the star's metallicity, and it orbits near the plane of the Milky Way galaxy.
Our own Milky Way has recently ( in the 1990s ) been confirmed to be a barred spiral, although the bar itself is difficult to observe from our position within the Galactic disk.
V838 Monoceros is located in the approximate direction of the Galactic anticenter and off from the disk of the Milky Way.
* In 1924, Oort discovered the galactic halo, a group of stars orbiting the Milky Way but outside the main disk.
For stars in the Milky Way disk, this corresponds to a mean baseline of 4 A. U. per year, while for halo stars the baseline is 40 A. U. per year.
SIM Lite measurements of Milky Way stars will yield data to understand four topics: fundamental Galactic parameters, the Oort Limit, disk mass potential, and mass of the Galaxy to large radii.
In this zone gas and dust in the disk of the Milky Way galaxy block the light from the galaxies lying behind it.
Properties in its favor include a high metallicity, minimal level of magnetic activity, low rotation rate, and kinematic membership in the thin disk population of the Milky Way.
It completes an orbit around the Milky Way galaxy about every 140 million years, during which it crosses the plane of the galactic disk every 53 million years.
believe that the preponderance of evidence points to the accretion of a small satellite galaxy of the Milky Way which was orbiting roughly in the plane of the galactic disk.
The data suggests that the trail of stars is actually part of the warped galactic thin disk and thick disc population and not a result of the collision of the Milky Way with a dwarf spheroidal galaxy.
from :- 10100000000 till :- 6500000000 text :" Formation of the Milky Way galactic disk "
The Milky Way is a large galaxy comprising an estimated 200 billion stars ( some estimates range as high as 400 billion ) arrayed in the form of a disk, with a central elliptical bulge ( some 12, 000 light-years in diameter ) of closely packed stars lying in the direction of Sagittarius.
When we look in the plane of the disk we see the combined light of its stars as the Milky Way.
Since then, microlensing has been used to constrain the nature of the dark matter, detect extrasolar planets, study limb darkening in distant stars, constrain the binary star population, and constrain the structure of the Milky Way's disk.
In each case, the lens population studied comprises the objects between Earth and the source field: for the bulge, the lens population is the Milky Way disk stars, and for external galaxies, the lens population is the Milky Way halo, as well as objects in the other galaxy itself.
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