* The Sun is a Main Sequence Star: It's currently in the most stable and longest phase of its life, fusing hydrogen into helium in its core. This process generates the immense energy that makes the sun shine.
* The Sun Has Billions of Years Left: It's estimated that the sun has about 5 billion years left in its main sequence stage.
* Eventually, the Sun Will Become a Red Giant: After it runs out of hydrogen, it will start to fuse helium and become a red giant. This will be a very different, much larger phase, but it will still be a star, not a dead one.
Dead stars are objects that have ceased nuclear fusion in their core and have cooled down to a very low temperature. The sun is far from that point.
