7.+Red+Giant


 * __Red Giant:

__ The above image shows a Red Giant.

** ** The above image shows the size of our sun compared to the size of it when it evolves into a Red Giant. ** __**Description:**__ A Red Giant in simple terms in just a luminous giant star that is in the later stage of Stellar Evolution. Red Giants are stars with radius's ten one hundred times larger than that of the Sun which have overexerted the supply of hydrogen in their cores and switched to fusing hydrogen in a shell hydrogen in a shell outside the core. The Sun is expected to become a Red Giant in approximately 5 billion years from now. There are some stars that do not become Red Giants. These stars are of a very low mass and do not contain helium in there cores and are therefore able to exhaust all there hydrogen without becoming Red Giants. These stars are called Red Dwarfs.

There is an endless list of reasons why a star like a Red Giant is uninhabitable one of the most simplest reasons is that the surface temperature of a Red Giant can range from 2500 to 3500 degrees celsius. Another reason is that there is no water or oxygen available because it is a star.
 * __Habitability:__**

__**Justification:**__ With the lack of water or oxygen on a Red Giant that alone is enough to make it uninhabitable, but then there also the major factor of the temperature and from 2500 to 3500 degrees celsius, it is impossible for a human to survive on a Red Giant.

1) **Stellar Evolution:** Is the process of which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the larger stars) to trillions of years (for the smaller stars). (Edited version of Wikipedia's Definition) 2)**Luminous**: The state of emitting light. 3) **Overexerted**: To use something to the point that it is all gone. e.g To exercise so much that you have no energy.
 * __Glossary:__**