All stars are slowly dying. The sun has maybe 5 billion years left.
Dying is not necessarily the right word to use. The sun emits heat and light because it is undergoing nuclear reactions, turning hydrogen into helium. Once it runs out of hydrogen, it will then start to use heavier elements in it’s nuclear reactions, slowly getting hotter and hotter. When it runs out of fuel, our sun will collapse and turn into a white dwarf. It will then cool off and cease to be a source of light and heat.
The sun is not dyeing, but it is kind of burning out. The sun is far enough away that it would take decades even centuries before we would stop seeing the light or feeling the heat from the sun.
Once it starts burning the heavier elements johannaag discusses above – specifically helium – it will expand significantly, becoming a red giant and taking out Mercury, Venus and probably Earth in the process. After it becomes a white dwarf, it will take another trillion years before it cools down to roughly the same temperature as the universe (a couple of degrees above absolute zero). Then the life cycle of the sun will be completely over.
Just as a side not, although the sun is indeed quite far away (around 93 million miles), if for some completely unforeseen reason it suddenly went out, it would take just eight minutes for the last of its light to reach Earth. Hopefully that doesn’t happen anytime soon.
For a simple but cute animation of the sun’s life, see here:
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