8.+Red+Supergiant


 * __Red Supergiant__**

They are the largest stars in terms of volume but not in mass. The red supergiant, as you would think, is a bigger version of the red giant. There are several layers in a red supergiant; -an outer **hull** of glowing red hydrogen and helium, which is inactive -below this layer is where hydrogen and helium is **fused** -next the helium is fused to carbon This goes on until the core iron is made.
 * __Description:__**

From this final stage of iron no more energy can be made. The core then cools down and eventually **implodes**.

A red supergiant shines with extreme brightness, but in space terms only for a short time which is several hundred thousand to million years. They have stellar winds which at times can blow away their hulls, they also **pulsate**.

This is an example of one of the red supergiants. media type="youtube" key="pl-oR7hTTYY" height="344" width="425"

A red supergiant would obviously not be capable of hosting any type of life for as it is too hot and cannot keep liquid water which is essential for life, it also emits to much radiation.
 * __Habitability:__**

Liquid water is essential for life, a red supergiant star could not be capable of having water.
 * __Justification:__**

Hull:** dry outer covering
 * __Glossary:__
 * Pulsate:** pulse, expand and contract rhythmically
 * Fused:** joined together
 * Implodes:** a sudden inward collapse