Red+Giant

===Red Giants are part of the later stages of a stars life. There can be a wide range of different size for many red giant stars. (some can be slightly smaller than our sun to about 10 times its solar mass) It is known that it won't be another 5 billion years till our sun will become a red giant.===



The picture on the right is a comparison with both our sun to a red giant.
===A star will stars core will start to run out of fuel, if it has already used about 10 to 20% of its hydrogen. The centre or core of a star when it begins to turn into a red giant, will start to increase in temperature while the outer atmosphere surface temperature will cool down to about 5,000 K.===

^Above you will find a diagram briefly explaning the contents of each layer of a later staged red giant.
http://nrumiano.free.fr/Estars/fading.html http://www.daviddarling.info/encyclopedia/R/redgiant.html http://en.wikipedia.org/wiki/Red_giant http://www.astronomynotes.com/evolutn/redgiant-core.png