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Definition: nucleus: A core. In the case of a comet, it is the central, solid part made of ice and dust. Space Tragedies9 Planets in Nine Days Astronomy 101 Related Articles ...
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The Atomic NucleusPlanck'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.
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The nucleus of the comet is nine miles (fifteen kilometres) wide, five miles wide (eight kilometres) long and five miles high.
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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; ...
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NucleusFor 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.
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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.
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NucleusThe "brains" of the cell, the nucleus directs cell activities and contains genetic material called chromosomes made of DNA. Mitochondria ...
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Nucleus of comet Tempel 1 imaged by the Deep Impact impactor. The nucleus measures about 6 kilometres across. Comet Hyakutake Main article: Comet nucleus ...
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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.
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nucleus Dense, central region of an atom, containing both protons and neutrons, and orbited by one or more electrons. Harvard-Smithsonian Center for Astrophysics60 Garden Street, Cambridge, MA 02138 USA Phone: 617.496.7941 Fax: 617.495.7356 ...
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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, ...
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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 Mid summer Night's Dream, the king of the fairies.
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Nucleus: the central part of an atom, consisting only of protons and neutrons, held together by the strong force the central part of a comet, whose existence is not a function of its distance from the sun -- the only "permenant" feature of a comet ...
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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.
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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.
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nucleus -- the core of an atom around which the electrons orbit. The nucleus has a positive electric charge and comprises most of an atom's mass.
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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 ...
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The nucleus, or solid part of a comet, is very small. It is like a dirty snowball. No one knows for sure what they are like inside. They seem to hold a lot of ice, some rocks and dust, and some gas.
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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.
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The nucleus of an atom is the very dense region, consisting of nucleons , at the center of an atom. Although the size of the nucleus varies considerably according to the mass of the atom, the size of the entire atom is comparatively constant....
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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.
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The nucleus of the Milky Way was until recently a mysterious region, obscured from view by dark clouds of interstellar dust.
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The nucleusAs previously noted, the traditional picture of a comet with a hazy head and a spectacular tail applies only to a transient phenomenon produced by the decay in the solar heat of a tiny object known as the cometary nucleus.
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When the nucleus is frozen, it can be seen only by reflected sun light. However, when a coma develops, dust reflects still more sun light, and gas in the coma absorbs ultraviolet radiation and begins to fluoresce.
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4. The cell nucleus houses the cell's genetic material, DNA and RNA, organized into chromosomes. The genetic material contains directions for making the cell's proteins.
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The nucleus, a tiny fraction of the volume of an atom, is composed of protons and neutrons, each almost two thousand times heavier than an electron.
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Although the nucleus of a quasar is extremely small - only the size of the Solar System - it emits up to 100 times as much radiation as an entire galaxy.
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Comet Halley's nucleus at a distance of 0.89 AU from Sol (more on the ESA's Giotto Mission and Comet Halley).
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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.
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[5.1] PROBING THE NUCLEUS[5.2] CHADWICK DISCOVERS THE NEUTRON[5.3] EXCHANGE PARTICLES / YUKAWA DESCRIBES THE STRONG FORCE ...
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Acquisition or absorption of an additional particle by an atomic nucleus.
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The burst is often confined to a few hundred parsecs near the nucleus, although disk-wide bursts are common.
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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.
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coma - The roughly spherical blob of gas that surrounds the nucleus of a comet; it is about a million km across.
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During a close passage near the Sun, the nucleus of a comet loses water vapour and other more volatile compounds, as well as dust dragged away by the sublimating gases.
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A comet nucleus is about the size of a mountain on earth. When a comet nears the Sun, heat vaporizes the icy material producing a cloud of gaseous material surrounding the nucleus, called a coma.
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They are ionised atoms ranging from a single proton up to an iron nucleus and beyond, but being typically protons and alpha particles.
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Spiral galaxies get their name from the shape of their disks, in which stars, gas and dust are concentrated in spiral arms that extend outward from the central nucleus of the galaxies.
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 See also: Light, Earth, Solar, Sun, Energy
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