• Question: How can you tell how old a star is?

    Asked by Anakin to Eimear, Jonathan, Lána on 16 Mar 2018.
    • Photo: Eimear Tuohy

      Eimear Tuohy answered on 16 Mar 2018:

      Scientists need to know the mass, spin rate and luminosity (amount of power it emits, which is related to it’s brightness). Using this information they can estimate the age of stars.