Core-collapse Supernovae
Supernovae can broadly be divided into two main categories depending on the type of progenitor star. Type Ia supernovae (SNIa) result from the explosion of a white dwarf which has exceeded the Chandrasekhar Limit.
Core
The Sun is, in its most basic description, a huge spinning ball of hot gas. It is approximately 90% hydrogen, 10% helium, and .1% lithium, carbon, and other elements. Okay, so that's easy enough to understand.
A stellar core fragment A stellar core fragment is a massive remnant of a collapsed star - part of the original stellar core - thrown out into space during the process of the star's collapse.
The large, dense core Galileo found within Io was deduced from data taken during the spacecraft's flyby within 559 miles of the moon last Dec. 7, as Galileo passed by the moon on its way to enter orbit around Jupiter.
Oddly enough, this is fairly strong evidence that it does not have a molten core. Rotating planets or moons with molten cores will produce magnetic fields through "the dynamo effect.
CORE"HALO RADIO GALAXIES
One common type of radio galaxy is often called a core"halo radio galaxy. As illustrated in Figure 25.
Core beliefs
The core beliefs of astrology were prevalent in most of the ancient world and are epitomized in the Hermetic maxim "as above, so below".
core
the central region of a planet, brown dwarf, star, or galaxy
corona ...
Core- in a star, the central region that is undergoing nuclear fusion; in a galaxy, the innermost few light-years
Crater- bowl-shaped depression formed by the impact of a meteoroid; depression around the orifice of a volcano ...
Core - The innermost region of the interior of the Earth or another planet ...
Core
Main article: Solar core
Cross-section of a solar-type star (NASA) ...
Core values
The Coast Guard, like the other armed services of the United States, has a set of core values
Core values ...
CORE - The central region of a star, planet or moon usually made of denser materials than the surrounding regions (mantle and crust). Earth and the Moon are thought to have cores of Ni-Fe metal.
Core-Halo Galaxies
A class of radio sources characterized by an emission "halo" surrounding a more intense "core". About 20% of the known extended radio sources are of the core-halo type.
Coriolis Effect ...
The Core
The Sun's core is the central region where nuclear reactions consume hydrogen to form helium. These reactions release the energy that ultimately leaves the surface as visible light.
The core of M87, revealing a black hole nucleus
Below is a NASA Hubble Space Telescope image of a spiral-shaped disk of hot gas in the core of active galaxy M87. Hubble measurements show the disk is rotating very rapidly.
The Core
The outer core has a radius of ~3500 km. The inner core has a radius of ~1250 km.
NASA CORE is a worldwide distribution center for NASA's educational multimedia materials. Educators may purchase exciting materials for a minimal charge.
Core: The Earth has a iron-nickel core that is about 2,100 miles in radius. The inner core may have a temperature up to about 13,000°F (7,200°C = 7,500 K), which is hotter than the surface of the Sun.
Core of Comet Halley
Cometary nuclei appear to be quite small in size. That of Comet Halley, for example, is an elongated body measuring only about 15 by 8 km (9 by 5 miles) with an estimated mass of 1017 grams.
Core: At the center of the planet is a molten rock core which is many times bigger and more massive than the entire Earth. It is 20,000 °C, about three times hotter than the Earth's core.
Core
The central region of a planet, star, or galaxy.
Cosmic Abundances ...
Core: The center region of a star where the temperature, pressure and density are the highest. In main sequence stars the core is where nuclear reactions take place.
Core
Using Doppler radio signal tracking, two-way radio ranging, and knoweldge of Pathfinder's stationary position, NASA was able to measure the rotation of the planet Mars.
CORE
The core is the innermost layer of the Earth (or any planet, moon, or star). It is usually under great pressure and is very hot.
...
Core principle of special relativity declaring that all constant-velocity observers are subject to an identical set of physical laws and that, therefore, every constant-velocity observer is justified in claiming that he or she is at rest.
*CORE/NSF Arrows to the Moon synopsis
* Artwork representing the cold war in space
* Space Race Exhibition at the Smithsonian National Air and Space Museum
* TheSpaceRace.com - Mercury, Gemini, and Apollo space programs ...
The core of the Sun is where it all begins. The temperature and density are high enough that protons can fuse and form helium nuclei, losing mass and releasing energy in the process. All of the energy emitted by the Sun was generated in the core.
The core spins at 2 to 10 kilometers/second at the core's equator. If no external forces produce torques, the angular momentum is constant. During a supernova the outer layers are blown off and the core shrinks to only 10 kilometers in radius! ...
The core is probably composed mostly of iron (or nickel/iron) though it is possible that some lighter elements may be present, too. Temperatures at the center of the core may be as high as 7500 K, hotter than the surface of the Sun.
The core of Monoceros R2 is dense - no more than 2 light-years across - and packed with massive young stars, as well as a cluster of infrared sources such as newborn stars still surrounded by material and dusty discs.
The core of the star collapses during the iron burning stage (since nothing is fighting the gravity), which takes only about 1/4 second. The collapsing process shrinks the core down to the size of the Earth.
The core accretion model describes fails to
explain how the largest gas giants could have
formed quickly from Sol's protoplanetary disk.
mar.core - ananke - performance ...
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The core collapse in the dying star releases a vast amount of gravitational potential energy, sufficient to blow away all the outer parts of the star in a violent explosion, and the star becomes a supernova.
inner core
0-1250 km
Earth's interior consists of a crust, mantle, outer core, and inner core. The crust has a low density and is silica-rich on the surface and silica-poor in the interior.
Solar core
Melting and boiling points are shown to precision, for pressure of 1 atmosphere. Values for stars, planet cloudtops, surfaces etc. are shown as round numbers rather than precise conversions.
Temperature Conversions ...
For the core, it does not heat up sufficiently for carbon-burning. When there's no more nuclear burning, it shrinks. It grows fainter as well as hotter and becomes a white dwarf.
= inner core revealed
earth size, carbon/oxygen, hot (white), faint
density ~ 5 × 10 5 g/cm3
electron degenerate pressure support
degeneracy pressure independent of temperature
more massive WDs are smaller
limiting mass 1.
When the core hydrogen runs out, main sequence stars balloon outward to become (depending on their masses) giants or supergiants. The lower a star's birth mass, the longer it will live.
Above the core and below the crust lies Venus' mantle, making up the bulk of the volume of the planet. Despite the high surface temperatures of Venus, the temperatures within the Venusian mantle are likely to be similar to those in the Earth's mantle.
Neptune's core contains more rock and metal than the cores of other gas giant planets. The planet has a magnetic field, which is tilted more than 50° to the rotation axis.
Mars has a core of iron in the middle, and a thick crust on the outside.
Time taken to orbit the Sun: 687 days.
Mars has 2 moons.
The central core of an atom, containing protons and neutrons; carries a net positive charge.
O
Objective Lens ...
The main or "core" population of the asteroid belt is sometimes divided into three zones, based on the most prominent Kirkwood gaps. Zone I lies between the 4:1 resonance (2.06 A.U.) and 3:1 resonance (2.5 A.U.) Kirkwood gaps.
Note: The core of this section is based on "Seeing dark matter in the Andromeda galaxy" by Vera Rubin, Physics Today, 59, no 12, p. 8-9, December 2006. Much of that same material can be read here ...
Gravitational core contraction after all the core helium is used up generates a temperature of about 5 × 108 K at which point carbon nuclei fuse together to produce sodium, neon and magnesium.
Mercury's iron core may also be responsible for one of the most surprising findings from Mariner 10 - the planet's weak magnetic field, 100 times weaker than Earth's.
(After Robert Bárány, 1876-1936, Swedish physician) bare core (NASA SP-7, 1965) A reactor core without a reflector.
bare core A reactor core without a reflector. barn (Abbr b) A unit of area for measuring a nuclear cross section. One barn equals 10-24 square centimeter. barocline = baroclinic.
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.
Umbra. The dark core or cores (umbrae) in a sunspot with penumbra, or a sunspot lacking penumbra.
Universal Time (UT). See Coordinated Universal Time.
Nucleus The positively charged core of an atom, consisting of protons and neutrons (except for hydrogen), around which electrons orbit.
Optical Radiation Electromagnetic radiation (light) that is visible to the human eye.
Does Jupiter Have a Solid Core?
Symbol for Jupiter
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How Far is Jupiter from the Sun?
Neutrinos, on the other hand, are absorbed only very weakly by matter and, once created by nuclear reactions in the stellar core, pass directly through the outer parts of the star.
Mercury is surprisingly dense, apparently because it has an unusually large iron core. With only a transient atmosphere, Mercury has a surface that still bears the record of bombardment by asteroidal bodies early in its history.
1 where R is an effective or core (but not isophotal) radius, s is the velocity dispersion (one-dimensional, in the line of sight), and I is an averaged intensity (commonly the mean within the effective radius).
Core - The center of a star or planet.
Double Star - A binary star; two or more stars orbiting each other.
Dust tail - the dust left behind a comet, reflecting sunlight.
A simplified way to think of an atom is very small core of relatively heavy neutrons and protons (which make up most of the atom's mass) surrounded by an electron "cloud".
Earth’s core (geology)
Earth’s crust (geology)
Earth’s mantle
Equator (geography)
Hubble Space Telescope (HST) (astronomy)
atmosphere (gaseous envelope)
atmospheric electricity
climate (meteorology)
dust ...
 See also: Light, Earth, Sun, Solar, Mass
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