What is the lifespan of a star?

Another question is: How often does a star have to die?

Supernovae occur on average once every 50 years in a galaxy as large as the Milky Way. In other words, a star explodes every second somewhere in the universe. Some of these are not too far from Earth.

What happens in the star's life? Once fusion reactions at its core are possible, a star is born. Stars live most of their lives in the main sequence star, where they fuse hydrogen to helium at their centres. The Sun is now halfway through its main sequence star life and will eventually swell to become a red giant star in 4.5 billion years.

You might also ask, "How does a star die?"

Stars die when they run out of nuclear fuel. The most massive stars burn up their hydrogen fuel very quickly but are hot enough that they can fuse heavier elements like carbon and helium. The star explodes as a supernova when there is no fuel left.

What happens to a star when it dies?

Death of a star. All stars eventually run low on hydrogen gas fuel, and then die. A high-mass star with no hydrogen left burns, it expands and is a red supergiant. Supergiants explode in a massive explosion that is called a supernova, while most stars fade away quietly.