Stars seem to have an anti-aging trick that humans can only dream about: their families.
Astronomers have discovered that the presence of the right-sized planet orbiting its parent fast enough seems to slow the star's aging process. Specifically, a closely orbiting gas giant can transfer angular momentum to the star's spin, countering the gradual loss of rotation resulting from the braking effect of the star's magnetic field.
However, many stars in the Universe occur in multiple-star systems. Binary stars are usually stellar twins, born in the same nebula, from the same clump of dust and gas. As such, their properties are often very similar. They have a similar color, size, brightness, and, yes, rotation. They sought out binary star systems where one star has exoplanets in orbit and the doesn't. They then used the planet-less star as a control to look for changes potentially wrought by the planet orbiting the other star.
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