: How do scientists determine the age of the stars, or just their remaining life time?

Question

: How do scientists determine the age of the stars, or just their remaining life time?

In: Chemistry

Answer 1

In a nutshell: as a star ages and consumes it’s fuel it begins burning heavier elements. By examining the signs of these elements being consumed we can use that as one way of measuring the age of a star. Combine that with size and luminosity and that gives an estimate of age and time left before transition to the next phase of it’s life. There’s more to it but that’s the ELI5 version.