A supernova remnant (SNR) is the structure resulting from the gigantic explosion of a star in a supernova. Supernova 1604, also known as Kepler's Supernova, Kepler's Nova or Kepler's Star, was a Supernova which occurred in the Milky Way, SN 1572 ( Tycho's Supernova, Tycho's Nova) "B Cassiopeiae" (B Cas or 3C 10 was a Supernova of Type Ia in the The Large Magellanic Cloud (LMC is a nearby Satellite galaxy of our own galaxy the Milky Way. A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth A supernova (plural supernovae or supernovas) is a stellar Explosion. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way. For the music album by Converter see Shock Front For the 1977 horror film see Shock Waves A shock wave (also called
There are two possible routes to a supernova: either a massive star may run out of fuel, ceasing to generate fusion energy in its core, and collapsing inward under the force of its own gravity to form a neutron star or a black hole; or a white dwarf star may accumulate (accrete) material from a companion star until it reaches a critical mass and undergoes a thermonuclear explosion. A neutron star is a type of remnant that can result from the Gravitational collapse of a massive Star during a Type II, Type Ib or Type A black hole is a theoretical region of space in which the Gravitational field is so powerful that nothing not even Electromagnetic radiation (e A white dwarf, also called a degenerate dwarf, is a small Star composed mostly of Electron-degenerate matter. In Astrophysics, the term accretion is used for at least two distinct processes
In either case, the resulting supernova explosion expels much or all of the stellar material with velocities as much as 1% the speed of light, some 3,000 km s-1. When this material collides with the surrounding circumstellar or interstellar gas, it forms a shock wave that can heat the gas up to temperatures as high as 10 million K, forming a plasma. In Physics and Chemistry, plasma is an Ionized Gas, in which a certain proportion of Electrons are free rather than being bound
Perhaps the most famous and best-observed young SNR was formed by SN 1987A, a supernova in the Large Magellanic Cloud that was discovered in 1987. SN 1987A was a Supernova in the outskirts of the Tarantula Nebula in the Large Magellanic Cloud, a nearby The Large Magellanic Cloud (LMC is a nearby Satellite galaxy of our own galaxy the Milky Way. Other well-known, older, supernova remnants include Tycho (SN 1572), a remnant named after Tycho Brahe, who recorded the brightness of its original explosion (AD 1572) and Kepler (SN 1604), named after Johannes Kepler. SN 1572 ( Tycho's Supernova, Tycho's Nova) "B Cassiopeiae" (B Cas or 3C 10 was a Supernova of Type Ia in the Tycho Brahe, born Tyge Ottesen Brahe ( December 14 1546 &ndash October 24 1601) was a Danish nobleman Supernova 1604, also known as Kepler's Supernova, Kepler's Nova or Kepler's Star, was a Supernova which occurred in the Milky Way, Johannes Kepler (ˈkɛplɚ ( December 27 1571 &ndash November 15 1630) was a German Mathematician, Astronomer The most recent remnant in our galaxy is G1.9+03, discovered in the galactic center and estimated to have gone supernova 140 years ago. Supernova remnant G19+03 is the youngest known Supernova remnant (SNR in the Milky Way Galaxy. 
An SNR passes through the following stages as it expands:
There are three types of supernova remnant:
Supernova remnants are the major source of Galactic cosmic rays. Galactic cosmic rays ( GCRs) consist of those Cosmic rays that enter the solar system from the outside  In 1949 Enrico Fermi proposed a model for the acceleration of cosmic rays through particle collisions with magnetic clouds in the interstellar medium.  This process, known as the "Second Order Fermi Mechanism", increases particle energy during head-on collisions, resulting in a steady gain in energy. A later model to produce Fermi Acceleration was generated by a powerful shock front moving through space. Particles that repeatedly cross the front of the shock can gain significant increases in energy. This became known as the "First Order Fermi Mechanism". 
Supernova remnants can provide the energetic shock fronts required to generate ultra-high energy cosmic rays. Observation of the SN 1006 remnant in the X-ray has shown synchrotron emission consistent with it being a source of cosmic rays. SN 1006 was a Supernova, widely seen on Earth beginning in the year 1006 CE Earth was about 7200 light-years away from the supernova This article concerns the physical phenomenon of synchrotron radiation However, for energies higher than about 1015 eV a different mechanism is required as supernova remnants cannot provide sufficient energy.