galactic disk definition
ded9835a19acd54e81abe6ab903d4381
Galactic disk Galactic Disk-A disk of matter, about 30 kiloparsec s (kpc) in diameter and 2 kiloparsec s thick, containing most of the stars and interstellar matter in the Milky Way ... galactic disk Flattened region of gas and dust that bisects the galactic halo in a spiral galaxy. This is the region of active star formation.
4055f4a8b8e531df78f60209c7882bd0
Galaxies Oasis in Space. Galaxies are defined as large groupings of stars, dust, and gas held together by gravity. They vary greatly in size and shape. Most of the objects we know of in space are contained within galaxies. They contain stars, planets, moons, comets, asteroids, nebulae, dust, neutron stars, and black holes. Many probably even contain large amounts of unseen dark matter. Since most of the space between galaxies is thought to be empty, a galaxy is essentially an oasis in space. Our own solar system is located within a galaxy. Our Sun is only one of over 100 billion stars in a galaxy called the Milky Way.
ae7bd65253ba604059c646679f46d0eb
disc (dɪsk) n. 1. a variant spelling (esp US and Canadian) of disc. 2. (Computer Science) computing Also called: magnetic disk or hard disk a direct-access storage device consisting of a stack of plates coated with a magnetic layer, the whole assembly rotating rapidly as a single unit.
d98839dc544256af4aac27b9fc560b28
- A disk refers to magnetic media, such as a floppy disk, the disk in your computer's hard drive, an external hard drive. Disks are always rewritable unless intentionally locked or write-protected.
a854e092e87844880631e01f5937242e
- A typical spiral galaxy is shaped like a flat disk, about 100,000 light-years in diameter, with a central bulge, or nucleus, containing old stars; winding through the disk are the characteristic spiral arms of dust, gas, and young stars (see stellar populations).
a8f28038280002394cf5e205a0834d44
- intervertebral disk the layer of fibrocartilage between the bodies of adjoining vertebrae; see also herniated disk.
e17d36ff45aa6a693f08a24c0745ae79
- Astronomy a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. (usually cap.) See Milky Way. any large and brilliant or impressive assemblage of persons or things:a galaxy of opera stars.
f23b89cb8d34e36c28ef57310d56b8d7
Disc (galaxy) A disc is a component of disc galaxies, such as spiral galaxies, or lenticular galaxies. The galactic disc is the plane in which the spirals, bars and discs of disc galaxies exist. Galaxy discs tend to have more gas and dust, and younger stars than galactic bulges, or galactic haloes. The galactic disc is mainly composed of gas, dust and stars. The gas and dust component of the galactic disk is called the gaseous disk. The star component of the galactic disk is called the stellar disk.
92ac4acc6761cb13b119a48c692b5f77
History of the floppy disk 8-inch, 5¼-inch, and 3½-inch floppy disks. A floppy disk is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, readable by a floppy disk drive (FDD), and sealed in a rectangular plastic carrier lined with fabric which serves the purpose of keeping the data storage disk free of foreign particles such as dust.
00fc55cb065e8ce49a14bf35d2fe1c3f
disk 2. disk-a flat circular plate. disc. acetate disk, phonograph recording disk-a disk coated with cellulose acetate. brake disk-a disk or plate that is fixed to the wheel; pressure is applied to it by the brake pads.
86e2608d2feea9bb531e2202d6209e87
- noun, Astronomy. 1. one of over a thousand known extragalactic objects, starlike in appearance and having spectra with characteristically large redshifts, that are thought to be the most distant and most luminous objects in the universe. Also called quasi-stellar object. Origin of quasar.
f2ee1bcc1bc6842c21c7eadf533429de
key-to-disk system [′kē tə ′disk ‚sis·təm] (computer science) A data-entry system in which information entered on several keyboards is collected on different sections of a magnetic disk, and the data are extracted from the disk when complete, and are copied onto a magnetic tape or another disk for further processing on the main computer. Want to thank TFD for its existence?
fb72e483b8690f36719cb1bad0dc7306
Lalande 21185 Although Lalande 21185 is almost 200 times dimmer than the Sun, it is among the brightest red dwarfs in the solar neighborhood. Moving perpendicular to the galactic plane at a high velocity of 47 km/s, Lalande 21185 appears to belong to the Galaxy's thick disk population and to be considerably older than the Sun.It has both a high radial velocity, of 86 km/s toward the Sun, and a high tangential velocity (proper motion) of 57 km/s.oving perpendicular to the galactic plane at a high velocity of 47 km/s, Lalande 21185 appears to belong to the Galaxy's thick disk population and to be considerably older than the Sun.
4e2047190e4c9df8150d4de02cd5c097
- The rotation curve is a plot of the orbital velocity of the clouds around the galactic center vs. their distance from the Galaxy center. The term rotation in this context refers to the motion of the galactic disk as a whole---the disk made of stars and gas clouds appears to spin.
d2d27aa46c3156f249c11964b2ef3b2b
disk n (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored. a small plastic magnetic disk enclosed in a stiff envelope with a radial slit; used to store data or programs for a microcomputer. a rigid magnetic disk mounted permanently in a drive unit.
495abee35edae43a1e47d2f843cc5291
Kuiper Belt Facts The Kuiper Belt (sometimes referred to as the Kuiper-Edgeworth Belt) is an area of the outer solar system that is estimated to stretch across 20 astronomical units (AU) of space.It contains small solar system bodies made mostly of ices.he Kuiper Belt extends from roughly the orbit of Neptune (at 30 AU out to about 55 astronomical units from the Sun. The main body of this belt covers much of this region, ranging from nearly 40 AU to 48 AU.
8db7c68273499d34e5deacd4eabbedb2
- Disks. A disk refers to magnetic media, such as a floppy disk, the disk in your computer's hard drive, an external hard drive. Disks are always rewritable unless intentionally locked or write-protected.
fad770e5e72222b7552add06fa74bcc5
Disk Cache A disk cache is an integrated part of the hard disk and is a standard feature of most hard disk drives. The size of disk cache ranges from 128 MB in standard disks to 1 GB in solid state disks. Typically, a disk cache stores the most recent and frequently used programs and data. When a user or program requests data, the operating system first reviews the disk cache.
5d991ce65c3393e3f021fa81bfd23b91
Airy disk In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light.The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern.he most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk.
d5ed572094385fc65cbb0181090a32a6
- Definition of INTERVERTEBRAL DISK. : any of the tough elastic disks that are interposed between the centra of adjoining vertebrae and that consist of an outer fibrous ring enclosing an inner pulpy nucleus.
bfa4a41a7a51ef2741ebbd74607aaabd
Galactic Roundel The Galactic Roundel, also known as the Emblem of the Galactic Republic, the Republic insignia, or the Insignia of Unity, was an eight-rayed stellar symbol centered in a circle whose circumference was made up of dashed lines. The Galactic Roundel was one of many seals of the Galactic Republic.
b8d54d23076d41bfb220e850a1d3a215
- A galaxy contains stars, gas and dust. In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a bulge, a disk containing spiral arms, and a halo.. Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.n a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a bulge, a disk containing spiral arms, and a halo.. Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.
388791d4a3e5fbb5e502abd1ee820a2d
- In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a bulge, a disk containing spiral arms, and a halo.. Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.
2f33b5f2c772c8cf2c72f3de76aa4da4
ARCHIVED: What is a disk image? ARCHIVED: What is a disk image? A disk image is a file that contains the file structure and contents of a storage device such as a CD-ROM, DVD, or hard drive partition. Disk images are frequently used to create exact duplicates of volumes, and to produce boot disks and software installation media.
2afdb75b7ee0ae2e67499ee0abbf4631
- Herniated Disk (Definition). Herniated disk is also known as Bulging disk. Herniated disk is a medical condition in which the gel like disk between the bones of the spine squeezes out of its center position.
4a2e186ae413503f3bdeec490d5718e5
retina Noun. 1. optic disk-the point where the optic nerve enters the retina; not sensitive to light. optic disc, blind spot. retina-the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve.