Supernovae are extremely powerful explosions of radiation. A supernova can emit as much energy as a Sun over its entire lifetime. A star will release most of its material when it undergoes this type of explosion. A supernova explosion can also help create new stars. There are two ways a supernova can be triggered. The first trigger is the result of a white dwarf accumulating matter from a companion. This causes the dwarf to reach an internal temperature too high to survive, resulting in an explosion. The second trigger is when a star's nuclear fuel is decreasing and can no longer support the release of nuclear energy. If the star's core is large enough it will rupture and become a supernova. Most observations of a supernova are made across spectral lines. The classification agrees with the physical one, because large stars are made mainly of hydrogen, while white dwarf stars are simple. White dwarfs have a bare environment because the explosion of the original star was so large that the winds pushed the hydrogen away. A star explodes with the help of gravitational collapse. When a star explodes due to nuclear fusion it is because so much mass has accumulated in its core that it cannot support the weight. Neutrons are the only things in nature that can stop a nucleus implosion. When a white dwarf undergoes a supernova, the energy comes from the uncontrolled fusion of carbon and oxygen in the core. After a supernova, the nucleus is likely to travel somewhere else in space. When the core is smaller than about 5 solar masses, the neutrons will stop the star from collapsing. This will create a neutron star. Neutron stars are observed as pulsars or X-ray binaries. When the nucleus is very large, nothing happens that is in the center of the paper. Supernovas emit many elements we have today, including hydrogen and heavier elements like iron. Supernovae also play an important role in the creation of new stars because the aftermath of the explosion creates an elemental environment for new interstellar reactions to occur. Discovering a supernova was difficult at first, as most occur far from our galaxy, but new technology now allows scientists to discover many supernovas within many galaxies. Works CitedThompson, Andrea. "What is a supernova?" Space.com. Np, nd Web. 13 November 2013. .Navata, R. “Supernovae.” Hyperphysics. Np, nd Web. November 13, 2013. “Supernovae.” Supernovae. Np, nd Web. November 13. 2013. .