Hey, Space Placers!
Our star, the Sun, every second of every day burns 600 million tons of Hydrogen and turns it into Helium via the nuclear fusion energy process. This has gone on for 5 billion years and will continue for billions more.
This is when stars start to change and begin their death sequence based upon how much mass they have. The more mass, the faster and more spectacularly the star will die.
About the time this happens to our Sun the Milky Way and Andromeda galaxies will be gravitationally intertwined to form a new galaxy called Milkomeda.
Nothing, not even our Universe, lasts forever as all the stars and gas will be consumed, leaving a dark and cold expanse.
Enjoy the Sun's light and warmth.....it won't last forever.
Sky Guy in VA