Definition: nucleus: A core. In the case of a comet, it is the central, solid part made of ice and dust.
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The nucleus of the 5 km long Comet Wild 2.
Credit: NASA/JPL
The nucleus of the 8 km long Comet Borrelly.
Credit: NASA/US Geological Survey ...
The Atomic Nucleus
Planck's law described the way hot matter in bulk radiated energy. To gain information about atoms themselves, however, one needs to understand the intricate structure of energy levels, as deduced from atomic spectra.
CONTOUR (Comet Nucleus Tour)
The CONTOUR spacecraft was launched in 2002 to study the comets Encke and Schwassmann-Wachmann 3 (SW3) and bring samples back to Earth.
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active galactic nucleus (AGN)
Chandra X-ray image of Centaurus A showing a bright central source: the active galactic nucleus suspected of harboring a supermassive black hole ...
Active galactic nucleus
An active galaxy is a galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy: stars, dust and interstellar gas.
Active galactic nucleus
Wikipedia, the free encyclopedia - Cite This Source ...
nucleus: relatively solid and stable, mostly ice and gas with a small amount of dust and other solids;
coma: dense cloud of water, carbon dioxide and other neutral gases sublimed from the nucleus; ...
Nucleus--Consists of mostly ice and gas, with some dust and other solids.
Coma--A dense water cloud, made up of carbon dioxide and neutral gases, that comes off of the nucleus.
Hydrogen cloud--A huge section of hydrogen.
nucleus Dense, central region of an atom, containing both protons and neutrons, and orbited by one or more electrons. The solid region of ice and dust that composes the central region of the head of a comet.
nucleus
the central region of an atom, comet, or galaxy
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Nucleus
M31 is known to harbor a dense and compact star cluster at its very center. In a large telescope it creates a visual impression of a star embedded in the more diffuse surrounding bulge.
NUCLEUS - Core of an atom, where most mass and all positive charge is concentrated. It consists of protons and neutrons.
Nucleus
(a) The central part of an atom, composed of protons and neutrons (which are made of quarks) and containing nearly all of each atom's mass.
(b) The central region of a galaxy.
Nucleus -- The central body of a comet.
Nutation -- A small nodding motion in a rotating body. Earth's nutation has a period of 18.6 years and an amplitude of 9.2 arc seconds.
nucleus
The core of an object, which can include a galaxy, star, comet or an element.
O
oblate
A non-circular object, such as the flattening of a gaseous planet due to a rapid rotation rate.
Nucleus: (see comet) Kilometer-sized "dirty snowball" composed of dust (refractory material) and primarily water-ice which gives rise to all of the features observers associate with comets.
Nucleus
the positively charged core of an atom, consisting of protons and neutrons (except for hydrogen), around which electrons orbit.
O
Oblateness
a measure of flattening at the poles of a planet or other celestial body.
Nucleus. The central part of an atom containing two particles; a proton and (with the exception of hydrogen) and a neutron.
Nucleus - The massive, positively charged core of an atom. The nucleus of an atom is surrounded by one or more electrons. A nucleus missing one or more accompanying electrons is called an ion ...
The Nucleus
The nucleus of the comet is nine miles (fifteen kilometres) wide, five miles wide (eight kilometres) long and five miles high.
comet nucleus
a solid, compact mass of rock and ice that heats up when exposed to sunlight and releases gas and dust
conjunction ...
[edit] Nucleus
Nucleus of comet Tempel 1 imaged by the Deep Impact impactor. The nucleus measures about 6 kilometres across.
Comet Hyakutake ...
The arcuate nucleus is an aggregation of neurons in the mediobasal hypothalamus, adjacent to the third ventricle and the median eminence.
Nucleus
For the first time images of a comet nucleus could be taken during the encounters with comet Halley. The nucleus was larger then expected at 16 by 7.5 by 8 kilometers (10 by 4.7 by 5 miles), implying a lower albedo (~0.04) than predicted.
nucleus - the solid core of the comet, it is mostly ice and gas with a small amount of dust and other solids;
coma - a dense cloud of water, carbon dioxide, and other gases spewed off by the evaporating nucleus as the comet nears the Sun; ...
Nucleus
mostly ice and gas with some dust and other matter
relatively solid and stable
Coma ...
Nucleus (plural=nuclei) The small, massive center of an atom containing its protons and neutrons bound together by nuclear force, the strongest force known in nature. The term is also used to describe the central body of a comet.
NUCLEUS
The nucleus is the frozen center of a head. The nucleus contains most of the comet's mass.
Astronomy Dictionary ...
NUCLEUS
The nucleus of an atom is its center, which contain most of the atom's mass; in the nucleus is everything but the orbiting electrons.
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nucleus - (n.)
(a.) Of an atom, the core of an atom, which has a positive charge, contains most of the mass, and takes up only a small part of the volume; (b) of a comet, the chunks of matter, taking up a volume no more than a few kilometers across, ...
nucleus -- The frozen core of a comet which contains almost the entire cometary mass and is located in the comet's head.
Oberon -- In William Shakespeare's A Midsummer Night's Dream, the king of the fairies.
Nucleus, Galactic: The central region of a galaxy characterized by high densities of stars. The nucleus may also contain a supermassive black hole and may be the source of considerable high-energy, nonstellar luminosity.
The nucleus, itself a composite body, was soon being described in various ways, none completely wrong but none uniquely right.
The nucleus of NGC 1300 shows an extraordinary "grand-design" spiral structure that is about 3,300 light-years (1 kpc) in diameter. Only galaxies with large-scale bars appear to have these grand-design inner spiral disks.
The nucleus of an atom is surround by electrons that occupy shells, or orbitals of varying energy levels.
The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron.
The nucleus of comet Halley as seen by the Giotto space probe. Image: ESA/MPAE Comets are named after their discoverers. Sometimes there is more than one independent discoverer and the comet then generally bears their combined names.
The nucleus of the comet is located at the center of each frame, but most of the light observed is caused by scattered sunlight from the coma of dust emitted from the nucleus.
Its nucleus is estimated around 1.4 miles across and rotates once every 18 hours. Those dimensions make Hartley 2 the smallest comet every imaged by a flyby probe.
The nucleus is very small, but bright. NGC 26 lies within the same field of view. I saw this object at the same time I spotted NGC 16 with my 8-inch SCT.
The nucleus of the Milky Way was until recently a mysterious region, obscured from view by dark clouds of interstellar dust.
The nucleus of a 4He atom, consisting of two protons and two neutrons. Mass of -Particle 4.00260 amu. [H76]
-Particle Nuclei
Nuclei formed by the -process. see Even-Even Nuclei [H76]
-Process ...
Comet Nucleus
The core of a comet, made up of ice, dirt, and rock.
Comet Shoemaker-Levy 9 (SL-9) ...
Yet our nucleus is nothing compared with some others. At the center of Messier 87 in the Virgo cluster lies a supermassive black hole of three THOUSAND million solar masses.
Galactic Nucleus
A tight concentration of stars and gas found at the innermost regions of a galaxy. Astronomers now believe that massive black holes may exist in the center of many galaxies.
deuterium nucleus mass
3.3435860× 10-24 grams
= 2.013553214 amu
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galactic nucleus Small central high-density region of a galaxy. Nearly all of the radiation from an active galaxy is emitted from the nucleus.
Comet Halley's nucleus
at a distance of 0.89 AU
from Sol (more on the
ESA's Giotto Mission
and Comet Halley).
As the cometary nucleus approaches the Sun, its dust surface becomes hotter, more heat is transferred through the crust, and the subsurface ice begins to sublimate.
There are electrons orbiting around the atomic nucleus. Almost all the mass of an atom concentrates at the nucleus, which has a typical size of 10-14m.
[5.1] PROBING THE NUCLEUS
[5.2] CHADWICK DISCOVERS THE NEUTRON
[5.3] EXCHANGE PARTICLES / YUKAWA DESCRIBES THE STRONG FORCE ...
An electron orbit a nucleus in a stable energy level. If a photon of a specific frequency interacts with the electron, it can gain sufficient energy to "jump up" one or more levels.
Acquisition or absorption of an additional particle by an atomic nucleus.
pair production An absorption process for X-ray and gamma ray radiation in which the incident photon is annihilated in the vicinity of the nucleus of the absorbing atom, with subsequent production of an electron and positron pair.
Electron A negatively charged elementary particle that normally resides outside (but is bound to) the nucleus of an atom.
Electron Flux The rate of flow of electrons through a reference surface.
The burst is often confined to a few hundred parsecs near the nucleus, although disk-wide bursts are common.
The apparent relationship between comets and meteor showers was interpreted by assuming that the cometary nucleus was an aggregate of dust or sand grains without any cohesion.
Although they are thought to account for only about 5-10% of the impacts, they approach Earth with greater speeds and higher energies than Earth-crossing asteroids of the same size (the nucleus of a comet, ...
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, ...
Composite image of the nucleus of Comet Halley produced from 68 original photographs taken by the …[Credit: Courtesy of H.U. Keller; copyright Max-Planck-Institut für Aeronomie, Lindau, Ger., 1986] ...
 See also: Light, Sun, Earth, Solar, Energy
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