HomeSpace NewsAlien planets keep their parent stars young with 'exercise'

Alien planets keep their parent stars young with ‘exercise’

Planets and stars are almost like parents and children, a new study suggests: The smaller bodies keep the larger ones active, helping them stay young for longer.  

The study looked at several stars that host what astronomers call hot Jupiters, giant gaseous worlds around the size of our solar system‘s largest planet, Jupiter. Hot Jupiters orbit very close to their parent stars — nearer than our solar system’s innermost planet, Mercury, orbits the sun. But because they are so enormous, the gravity of hot Jupiters tugs at the stars around which they orbit, making them spin faster. This extra exercise makes the star crackle in X-rays, which is typical for stars in their young adulthood. 

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