9.+Supernova

__**Supernova/plural: supernovae:

**__ [|Kepler's] [|Supernova Remnant]

A supernova can be described as one of the most energetic or **stellar explosions** in nature. A suprnova usually occurs at the end of a star's lifetime, when the star is no longer supported by nuclear energy. It then collapses and releases a massive amount of energy, what follows from this collapse is a blast wave. You can compare one supernova to a **megaton bomb** or a further comparison to the sun would be that a supernova emits as much light as a sun would in a whole lifetime. Supernovaes usually last then fade away after several weeks or months.
 * __Description:__**

Supernovae are extremely **radiant** and often can outshine a whole galaxy with a brief burst of radiation, and after a few weeks or months they gradually fade away.

There are two types of supernovaes, type 1 and type 11, they are then further specified to types la, lb, lc and type ll. The 2 most basic types are la and ll. Is where in some binary star systems a carbon-oxygen **white dwarf** is is grown together with matter from a companion. What actually happens is so much mass piles up on the white dwarf that its core reaches its **critical density**, this results in the detonation or explosion of the star.
 * __TYPE LA.__**

When a stars nuclear energy runs out and the release of this energy is no longer supporting it. If the star's core is big enough it will collapsed and become a supernova.
 * __TYPE ll.__**

These types were originally classified by the existence of **hydrogen spectral lines**, and is this case type la does not show them and type II does. In another case if the star's stellar wind has gotten rid of the hydrogen in the star's **atmosphere** by the time of this explosion, then it does not either show the hydrogen spectral lines, but is not always classfied as type II, it is given the title lb.

Here is an animation of a supernova.



Here is a visual presentation of light echoes from 1572 supernova.

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 * __Habitability:__** It is absolutely impossible for life to be present or sustained on or in a supernova because of the simple fact that is an explosion and life can not be sustained in an explosion. Also, you can only view a supernova not visit the area of the explosion during a supernova, therefore there is no possibility of a supernova inhabiting life at any time.

As a supernova is an explosion, the only possible thing involving a supernova that we can experience is viewing it, besides that visiting or living during the area, on the area or around the area during a supernova is impossible. This rules out any habitability chances.
 * __Justification:__**


 * __Glossary:__**
 * Stellar Explosion:** massive explosion
 * Megaton Bomb:** a nuclear weapon with an explosive power equivalent to one million tons of TNT
 * Radiant:** beaming brightly
 * White Dwarf:** a faint star of enormous density
 * Critical Density:** the density of matter which would bring expansion to a halt
 * Hydrogen Spectral Lines:** light given off at a specific frequency by hydrogen matter or molecule
 * Atmosphere:** enviroment or surroundings or the unit of pressure of surroundings