Disk

Disk galaxys are one of the two main types of galaxy observed in the universe, the other type being elliptical galaxies. We live in a disk galaxy called the Milky Way, it is a spiral disk galaxy.

Definition: disk: The visible surface of the sun or any other heavenly body projected against the sky. Space Tragedies9 Planets in Nine DaysAstronomy 101 Related Articles ...

A disk of dust around the star Beta Pictoris, a young, Sun-like star about 63 light-years from Earth, has chemical properties similar to objects in our solar system and may harbor a planet.

The disk's outskirts are irregular, suggesting to Ibata and his colleagues that Andromeda likely snatched the material from galaxies that wrecked themselves on Andromeda's shores.

Airy disk The central spot in the diffraction pattern of the image of a star at the focus of a telescope, named after George Airy. It is surrounded by several fine diffraction rings like the rings around the bull's-eye of a target.

Full Disk Neptune On its approach to in August 1989, Voyager 2 captured this image of the fourth and outermost of the giant gas planets. This image shows two of the four oval cloud features tracked by the cameras.

Dust Disk NASA, JPL, University of Florida Larger false-color and black and white images.

GALAXIES, DISK, EVOLUTION Joshua E. Barnes Galaxies come in a bewildering variety of shapes and sites, but a large majority - perhaps 80% - possess a disk of some kind.

Accretion disk From Memory Alpha, the free Star Trek reference. Jump to: navigation, search ...

Dynamics in Disk Galaxies A detailed understanding of the internal working of galaxies must incorporate their dynamics - just how the gravitational potential and internal motions balance to give galaxies their forms.

Protoplanetary disk A proplyd forming in the Orion Nebula. The protoplanetary disk HH-30 in Taurus, about 450 light years away. The disk emits the reddish stellar jet, a common structure of these formations.

Protoplanetary disk Wikipedia, the free encyclopedia - Cite This Source ...

Disk rotates : Sun's speed ~220 km/s Sun's orbital period ~200 million yrs about 50 rotations since birth of galaxy Kepler's law - M ~ 10 11Msun inside of Sun's orbit ...

Disk- the visible surface of the Sun (or any heavenly body) projected against the sky Doppler effect- change in the observed frequency of sound or radiation that takes place when the observer and the source are moving relative to each other ...

Disk The surface of the Sun or other celestial body projected against the sky. Double Asteroid Two asteroids that revolve around each other and are held together by the gravity between them. Also called a binary asteroid.

disk The flattened structure of a circular collection of material, which often refers to the overall structure of a spiral galaxy.

Disk, galactic: The flattened, rotating portion of the Galaxy, centered on the galactic nucleus, containing much dust and gas as well as newly formed stars. Galactic disks are found in sprial galaxies and often exhibit prominent spiral arms.

Disk Component All material confined to the plane of the galaxy. Distance Indicator ...

disk (a) A flattened, circular region of gas, dust, and/or stars. It may refer to material surrounding a newly-formed star; material accreting onto a black hole or ; or the large region of a spiral galaxy containing the spiral arms.

disk -- the flat, round portion of a galaxy. The Sun lies in the disk of the Milky Way. dispersion -- the spreading of light or other electromagnetic radiation into a spectrum. A rainbow is an example of dispersion of light caused by raindrops.

Disk Instability - A possible explanation for the origin of a close binary pair of stars in which one star forms within the disk of gas and dust orbiting another, newly formed star ...

disk - (n.) (a.) Of a galaxy, the disk-like flat portion, as opposed to the nucleus or the halo; (b) Of a star or planet, the two-dimensional projection of its surface. distance modulus - (n.) ...

Disk. The appearance or face of a planet, star or moon as seen from Earth. Diurnal. Another name for daily.

Disk (of a spiral galaxy) The central plane, as distinguished from the halo or the nucleus. Disk Star ...

disk (of a galaxy) The disk-shaped distribution of Population I stars that dominates the appearance of a spiral galaxy. disk component ...

A disk of dust and gas encircles the star with a tilt of 30 degrees and the planet shares this orientation. This is direct evidence for the formation of planets from disks of this kind, which are seen around many other young stars.

The disk eventually thins as more material falls onto the star and the protoplanets. A hole in the disk near the star forms as material is completely incorporated into the star and planets.

The disk is surrounded by a spheroid halo of old stars and globular clusters. While the disk contains gas and dust obscuring the view in some wavelengths, the halo does not.

The disk defines the orbital plane of the youngest stars in the galaxy. The disk is much thinner than its diameter. The orbits are nearly circular around the center of the Galaxy.

The disk includes solutions to the problems and is distributed with the understanding that such solutions will only be available to teachers. Questions from Users: Advice to home-schooling parent Timeline Glossary Math index ...

Some disk galaxies have no spiral arms and are called ``S0'' (``SB0'' if there is a bar) or lenticular galaxies. They are placed at the point in the tuning fork diagram where it brances off to the regular spiral or barred spiral pattern prong.

Thin disk around Beta Pictoris. [more] HD 141569: Gap in stellar dust disk. [more] HR 4796A: Dust ring around star. [more] ...

Huge Disk Galaxy (117K GIF) This is the Andromeda Galaxy, our nearest large neighbor galaxy. (86K GIF) ...

Full-disk mosaic of the million-degree Sun by TRACE Due to the high spatial (1 arc second) and temporal resolution (1-5sec), TRACE has been able to capture highly detailed images of coronal structures, ...

thick disk Region of a spiral galaxy where an intermediate population of stars resides, younger than the halo stars, but older than stars in the disk.

A dust disk believed to circle a black hole in the galaxy NGC 7052 Image courtesy the Space Telescope Science Institute ...

Cipher disk A cipher disk is an enciphering and deciphering tool developed in the 15th century by Leon Battista Alberti.

Galactic Disk A flattened disk of gas and young stars in a galaxy. Some galactic disks have material concentrated in spiral arms (as in a spiral galaxy) or bars (as in barred spirals). Galactic Halo ...

Accretion Disk A relatively flat, rapidly rotating disk of gas surrounding a black hole, a newborn star, or any massive object that attracts and swallows matter.

Accretion Disk: A disk of gas that accumulates around a center of gravitational attraction, such as a white dwarf, a neutron star, or a black hole.

accretion disk The whirling disk of gas that form around a compact object such as a white dwarf, neutron star or black hole as matter is drawn in. active galactic nuclei (AGN) ...

ACCRETION DISK An accretion disk is a flat disk of gas and dust in space that surrounds a newborn star, black hole, or other enormous object that is growing by attracting matter to it with its gravitational field.

We live in a disk-shaped Galaxy of some 200 billion stars that we see around us as the broad white band of the Milky Way.

Discovered a disk of dust grains around the star Vega Detected disks of material around several other stars. Detected several probable protostars embedded in clouds of gas and dust ...

Galaxy A large disk or ball of billions of stars and nebulae. They are the largest individual structures in the Universe.

a central, flat disk containing a dense cloud of interstellar matter and young star clusters (mostly on the arms) a central bulge (or nucleus) containing older stars ...

When seen on the disk, a darkening appears and then a rising in an active region. Then two bright areas appear as ribbons. They expand rapidly and get extremely bright, and the ejection occurs at this point.

Kuiper belt -- A disk-shaped region about 30 to 100 AU from the sun considered to be the source of the short-period comets.

mater: the heavy disk which forms the base of an astrolabe. mean solar day: the time between successive transits of the fictitious mean Sun (i.e.

*Uranus' apparent disk size, on the other hand, is only one-sixteenth as large Venus'. To find the proportionate disk size, you always square the diameter (1/4 X 1/4 = 1/16). copyright 2004 by Bruce McClure Mercury in the Morning ...

M-region magnetic storm (NASA SP-7, 1965) A magnetic storm that is independent of visible solar disk features; it begins gradually and shows a strong tendency to recur within a period of 27 days.

The extent to which the disk of the moon or the planet, as seen from the earth, is illuminated or not illuminated by the sun. 4. In astronomy = configuration. phase angle 1.

An ACTIVE PROMINENCE seen on the DISK. ACTIVE LONGITUDE. The approximate center of a range of heliographic longitudes in which ACTIVE REGIONS are more numerous and more FLARE-active than the average. ACTIVE PROMINENCE.

coronagraph a special instrument which blocks light from the disk of the Sun in order to study the faint solar atmosphere. cosmic ray an extremely energetic (relativistic) charged particle.

1755 - Drawing on Wright's work, Immanuel Kant conjectures that the galaxy is a rotating disk of stars held together by gravity, and that the nebulae are separate such galaxies, 1845 - Lord Rosse discovers a nebula with a distinct spiral shape ...

Whatever be the subsequent method of reduction, the instant is required when the planet's disk is in internal contact with that of the sun; but after contact has plainly passed it still remains connected with the sun's rim by a " black drop, ...

Because its orbit lies between the sun and the orbit of the earth, Venus passes through phases like those of the moon, varying from a large bright crescent when the planet is near inferior conjunction (nearest the earth) to a smaller silvery disk ...

For it resemblance with the planet Saturn it is called Saturn Nebula: in larger scopes it appears as a bright inner ring surrounded by a patchy disk. Small scopes show a misty greenish disk of 8th mag.

A beautiful example is Orientale (see Figure 31), whose mountain ramparts can just be seen from the Earth near the Moon's limb (the apparent edge of the lunar disk) when the lunar libration is favourable.

The diameter of the disk is about 100,000 light-years. 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, ...

See also: Light, Sun, Solar, Star, Earth