Rotation rate reveals a star's age
from Physics World
Using NASA's Kepler space telescope, a team at Harvard-Smithsonian Center for Astrophysics has
measured the rotation rates for stars
in a 1 billion-year-old cluster called NGC 6811. Kepler is designed to detect small changes in brightness and therefore able to measure the spin of a variety of stars. A star's rotation rate can be correlated to its age, and its color can be related to its mass. So observing a star's color and its periodic changes, it has been possible to find a correlation between rotation rate, mass and age.
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