The sun and it's eventual dangers!

Red dwarf

The sun:
The thing that keeps humanity alive. But It's star and all stars come to an end right?What were to happen if our sun came to an end.The way this will happen is when the sun runs out of it fuel (hydrogen). The sun will collapse but as it does that gravity heats up the star to millions of degrees causing it to expand about 3 time its size.As it expands it engulfs Mercury,Venus and possibly Earth.This is called a red dwarf because when it stops expanding it shrinks and gives of little specs of light BUT there is no reason to worry because this wont happen for another 6 billion years.