Learn astronomy

Red giant star is called a huge star who has 5 to 10 times more mass than our sun. And its surface temperature is 4700 ° C. The Red Giant is considered to be the old star of our space, whose fuel is about to run out There are 2 types of stars found in the Red Giant stars R.G.B.( red-giant branch ) :- The red giant whose all hydrogen has fused to helium.   A.G.B. ( asymptotic-giant-branch ) :-  A red giant whose helium has also started to fuse and they have started the process of making carbon.. In the next 5 billion years, the fuel of our sun will also be exhausted and it will turn into a red giant.