Red+Giant

Red Gaint Red Gaint is basically a sun after billions of years when the sun runs out of protons the only thing left is the core of the what used to be the sun. when that happens the only thing left is alphas which is nuclei of helium atom. Because the sun becomes old and the sun runs out of energy and the out side of the sun starts to co-laps with in it self, when this happens the "used to be sun" is able to heat its self to be able to fuse the left over protons and the alphas. the sun then gains a new source for power and becomes really hot in fact the core becomes hotter then when it was a sun this cause the outer part of the leftover sun to swell meaning the sun becomes more bigger. The star gives out a weak radiation by the time it get to surface you can determine the radition is week because week radiation is red. When all this happens a star turns into a Red Giant. for example our sun looks something along the line like this after 4-5 billion years the sun will eventually become a red Gaint and look like this.