Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Type_II_supernova> ?p ?o }
- Type_II_supernova abstract "A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star. A star must have at least 8 times, and no more than 40–50 times, the mass of the Sun (M☉) for this type of explosion. It is distinguished from other types of supernovae by the presence of hydrogen in its spectrum. Type II supernovae are mainly observed in the spiral arms of galaxies and in H II regions, but not in elliptical galaxies.Stars generate energy by the nuclear fusion of elements. Unlike the Sun, massive stars possess the mass needed to fuse elements that have an atomic mass greater than hydrogen and helium, albeit at increasingly higher temperatures and pressures, causing increasingly shorter stellar life spans. The degeneracy pressure of electrons and the energy generated by these fusion reactions are sufficient to counter the force of gravity and prevent the star from collapsing, maintaining stellar equilibrium. The star fuses increasingly higher mass elements, starting with hydrogen and then helium, progressing up through the periodic table until a core of iron and nickel is produced. Fusion of iron or nickel produces no net energy output, so no further fusion can take place, leaving the nickel-iron core inert. Due to the lack of energy output allowing outward pressure, equilibrium is broken.When the mass of the inert core exceeds the Chandrasekhar limit of about 1.4 M☉, electron degeneracy alone is no longer sufficient to counter gravity and maintain stellar equilibrium. A cataclysmic implosion takes place within seconds, in which the outer core reaches an inward velocity of up to 23% of the speed of light and the inner core reaches temperatures of up to 100 billion kelvin. Neutrons and neutrinos are formed via reversed beta-decay, releasing about 1046 joules (100 foes) in a ten-second burst. The collapse is halted by neutron degeneracy, causing the implosion to rebound and bounce outward. The energy of this expanding shock wave is sufficient to accelerate the surrounding stellar material to escape velocity, forming a supernova explosion, while the shock wave and extremely high temperature and pressure briefly allow for theproduction of elements heavier than iron. Depending on initial size of the star, the remnants of the core form a neutron star or a black hole. Because of the underlying mechanism, the resulting nova is also described as a core-collapse supernova.There exist several categories of Type II supernova explosions, which are categorized based on the resulting light curve—a graph of luminosity versus time—following the explosion. Type II-L supernovae show a steady (linear) decline of the light curve following the explosion, whereas Type II-P display a period of slower decline (a plateau) in their light curve followed by a normal decay. Type Ib and Ic supernovae are a type of core-collapse supernova for a massive star that has shed its outer envelope of hydrogen and (for Type Ic) helium. As a result, they appear to be lacking in these elements.".
- Type_II_supernova thumbnail HST_SN_1987A_20th_anniversary.jpg?width=300.
- Type_II_supernova wikiPageID "11009033".
- Type_II_supernova wikiPageLength "39436".
- Type_II_supernova wikiPageOutDegree "170".
- Type_II_supernova wikiPageRevisionID "679409353".
- Type_II_supernova wikiPageWikiLink 1997cy.
- Type_II_supernova wikiPageWikiLink 1997ef.
- Type_II_supernova wikiPageWikiLink Absolute_magnitude.
- Type_II_supernova wikiPageWikiLink Aluminium.
- Type_II_supernova wikiPageWikiLink Argon.
- Type_II_supernova wikiPageWikiLink Astrophysicist.
- Type_II_supernova wikiPageWikiLink Astrophysics.
- Type_II_supernova wikiPageWikiLink Atomic_mass.
- Type_II_supernova wikiPageWikiLink Atomic_nucleus.
- Type_II_supernova wikiPageWikiLink Baksan_Neutrino_Observatory.
- Type_II_supernova wikiPageWikiLink Balmer_series.
- Type_II_supernova wikiPageWikiLink Beta-decay.
- Type_II_supernova wikiPageWikiLink Beta_decay.
- Type_II_supernova wikiPageWikiLink Binary_star.
- Type_II_supernova wikiPageWikiLink Binding_energy.
- Type_II_supernova wikiPageWikiLink Black_hole.
- Type_II_supernova wikiPageWikiLink Brady_Haran.
- Type_II_supernova wikiPageWikiLink Calcium.
- Type_II_supernova wikiPageWikiLink Carbon.
- Type_II_supernova wikiPageWikiLink Carbon-burning_process.
- Type_II_supernova wikiPageWikiLink Carbon_burning_process.
- Type_II_supernova wikiPageWikiLink Cassiopeia_A.
- Type_II_supernova wikiPageWikiLink Category:Supernovae.
- Type_II_supernova wikiPageWikiLink Chandrasekhar_limit.
- Type_II_supernova wikiPageWikiLink Cobalt.
- Type_II_supernova wikiPageWikiLink Computer_model.
- Type_II_supernova wikiPageWikiLink Computer_simulation.
- Type_II_supernova wikiPageWikiLink Convective_overturn.
- Type_II_supernova wikiPageWikiLink Degeneracy_pressure.
- Type_II_supernova wikiPageWikiLink Degenerate_matter.
- Type_II_supernova wikiPageWikiLink Density.
- Type_II_supernova wikiPageWikiLink Electron.
- Type_II_supernova wikiPageWikiLink Electron_capture.
- Type_II_supernova wikiPageWikiLink Electrons.
- Type_II_supernova wikiPageWikiLink Electronvolt.
- Type_II_supernova wikiPageWikiLink Elementary_particle.
- Type_II_supernova wikiPageWikiLink Elementary_particles.
- Type_II_supernova wikiPageWikiLink Elliptical_galaxies.
- Type_II_supernova wikiPageWikiLink Elliptical_galaxy.
- Type_II_supernova wikiPageWikiLink Endothermic.
- Type_II_supernova wikiPageWikiLink Endothermic_process.
- Type_II_supernova wikiPageWikiLink Energy_level.
- Type_II_supernova wikiPageWikiLink Exothermic.
- Type_II_supernova wikiPageWikiLink Exothermic_process.
- Type_II_supernova wikiPageWikiLink Fermion.
- Type_II_supernova wikiPageWikiLink File:HST_SN_1987A_20th_anniversary.jpg.
- Type_II_supernova wikiPageWikiLink Fluid_dynamics.
- Type_II_supernova wikiPageWikiLink Foe_(unit).
- Type_II_supernova wikiPageWikiLink Frequency.
- Type_II_supernova wikiPageWikiLink Fundamental_interaction.
- Type_II_supernova wikiPageWikiLink Galaxies.
- Type_II_supernova wikiPageWikiLink Galaxy.
- Type_II_supernova wikiPageWikiLink Gallium.
- Type_II_supernova wikiPageWikiLink Gamma-ray_burst.
- Type_II_supernova wikiPageWikiLink Gamma-ray_bursts.
- Type_II_supernova wikiPageWikiLink Gamma_ray.
- Type_II_supernova wikiPageWikiLink Gamma_rays.
- Type_II_supernova wikiPageWikiLink Gravitation.
- Type_II_supernova wikiPageWikiLink Gravity.
- Type_II_supernova wikiPageWikiLink H_II_region.
- Type_II_supernova wikiPageWikiLink Helium.
- Type_II_supernova wikiPageWikiLink History_of_supernova_observation.
- Type_II_supernova wikiPageWikiLink Hydrodynamics.
- Type_II_supernova wikiPageWikiLink Hydrogen.
- Type_II_supernova wikiPageWikiLink Hydrogen_burning_process.
- Type_II_supernova wikiPageWikiLink Hydrostatic_equilibrium.
- Type_II_supernova wikiPageWikiLink Hypernova.
- Type_II_supernova wikiPageWikiLink Hypernovae.
- Type_II_supernova wikiPageWikiLink Implosion_(mechanical_process).
- Type_II_supernova wikiPageWikiLink Ionization.
- Type_II_supernova wikiPageWikiLink Ionize.
- Type_II_supernova wikiPageWikiLink Iron.
- Type_II_supernova wikiPageWikiLink Irvine-Michigan-Brookhaven_(detector).
- Type_II_supernova wikiPageWikiLink Irvine–Michigan–Brookhaven_(detector).
- Type_II_supernova wikiPageWikiLink Joule.
- Type_II_supernova wikiPageWikiLink Kamioka_Observatory.
- Type_II_supernova wikiPageWikiLink Kelvin.
- Type_II_supernova wikiPageWikiLink Lepton_number.
- Type_II_supernova wikiPageWikiLink Light_curve.
- Type_II_supernova wikiPageWikiLink Linear.
- Type_II_supernova wikiPageWikiLink Linearity.
- Type_II_supernova wikiPageWikiLink Luminous_blue_variable.
- Type_II_supernova wikiPageWikiLink Magnesium.
- Type_II_supernova wikiPageWikiLink Matter.
- Type_II_supernova wikiPageWikiLink MeV.
- Type_II_supernova wikiPageWikiLink Neon.
- Type_II_supernova wikiPageWikiLink Neon-burning_process.
- Type_II_supernova wikiPageWikiLink Neon_burning_process.
- Type_II_supernova wikiPageWikiLink Neutrino.
- Type_II_supernova wikiPageWikiLink Neutrino_oscillation.
- Type_II_supernova wikiPageWikiLink Neutron.
- Type_II_supernova wikiPageWikiLink Neutron_degeneracy.
- Type_II_supernova wikiPageWikiLink Neutron_star.
- Type_II_supernova wikiPageWikiLink Nickel.