They are the most energetic events that occur in our universe (Chaisson and McMillan, 548) . Supernovas occur when the fusion inside the stars core slows down and under the force of gravity the core to starts to shrink, thus causing the star to become much hotter and denser. When the fusion process ends it leaves mainly iron inside of the core (Dove). The star goes supernova when the internal temperature of the star reaches about one billion degrees Celsius, all of the iron particle that are left inside the star that are all smashed together start to repel against one another (Dove). This causes the core of the star to shrink even more, eventually causing it to explode, thus causing a supernova (Thompson).
During fusion, outward pressure is created to balance the inward pull of gravity. However once the star runs out of fuel, the star will expand into a red supergiant. While the star is still a red supergiant, the core become hotter and denser. During this time more nuclear reactions occur, delaying the collapse of the core. However once the core is out of fuel this time, it has nothing left to fuse and the core collapses.
If the compressed cloud has no way to stop the contraction, it’ll continue to collapse and raise the gas pressure sufficiently to resist further contraction. Supernova 1994D Another possible explanation for the contraction that is occurring at this time is due to shockwaves from surround supernovas. (Kippenhahn, 1994). At this point the contracted interstellar clouds are called Bok globules. Globules are usually a few light years in size and they are made up of hydrogen and dust.
In this state, they glow and burn hydrogen in their core, converting it into helium through nuclear fusion. The stages of a stars stellar lifecycle that follow after the main sequence star phase depend predo... ... middle of paper ... ...om collapsing from neutron degeneracy pressure it will become a neutron star. These are detectable ____ If the mass of the leftover core of a high-mass star is greater than about 3 solar masses, the neutron degeneracy pressure can’t stop gravitational collapse and there is no known physical force capable of stopping this collapse. The core consequently collapses into a black hole. As you can now see, the remnants of stellar evaluation are determined predominantly by the mass of a star right from the beginning of its stellar lifecycle.
Some stars live fast and die young; others die slowly and quietly (“Extreme”). The life cycle of a star is violent, they churn, pulsate, and sometimes explode, but the products of its life are invaluable building blocks for the Universe. There is a process to the life cycle of a star. The birth of a star is a process completely fueled by gravity (“Life”). All stars are born in something called a nebula, which is essentially just a cloud of gas and dust.
Star formation, evolution, and explosion is a continual process that imbues the interstellar medium with heavy elements and enables the formation of new stars. There would not be life on Earth without the elements generated by supernovae (McMillan, 2011). After a high-mass star explodes in a supernova all that is left intact is a relatively small, about the size of a small asteroid, very massive ball of neutrons. This remnant is called a neutron star, even though it is not actually a star. New neutron stars rotate very rapidly and have extremely strong magnetic fields with hot spots localized near the magnetic poles where radiation is emitted in concentrated beams of light that radiate through the cosmos like a revolving beacon.
A black hole is formed when a massive star collapses on itself. To determine if the star will create a black hole, the mass of the star must be looked at. If the star has a low-mass, when the core collapses the star will create a strong explosion, but will have little fall back. This low-mass explosion will cause a neutron star. If the star has a moderate-mass, it will produce an explosion, but will create enough fall back to form a black-hole.
For small stars, when the nuclear fuel is exhausted and there are no more nuclear reactions to fight gravity, the repulsive forces among electrons within the star eventually create enough pressure to halt further gravitational collapse. The star then cools and dies peacefully. This type of star is called the "white dwarf." When a very massive star exhausts its nuclear fuel it explodes as a supernova. The outer parts of the star are sent into space and the core falls under its own weight.
When a star goes supernova, it blows the outer layers of material off into space leaving only the core. If the star was large enough, only the core will remain. Because the core is unable to produce energy through nuclear fusion, gravity starts to press the core in on itself. As the star gets denser and denser, this process speeds up. Once there is no more room, this process stops One of the many extremes on a neutron star is the density.