The Star Wars universe is packed with evocative locations, from the desert planets of Tatooine and Jakku in The Force Awakens, to the frozen environs of Hoth, the Cloud City of Bespin, the entrancing lakes of Naboo and the volcanic nightmare of Mustafar.

Tatooine's binary suns in A New Hope - Kepler-16b

"If there's a bright centre to the universe, you're on the planet that's farthest from," says Luke Skywalker in A New Hope.

Actually, it's our solitary Sun that's the odd one out here; astronomers reckon that about 80% of stars are multiple-star systems, which means that worlds with two, three or even seven sunsets are the norm.

Multiple star systems are everywhere you look; next time you're outside in clear night skies, look north to find the second star in from the tip of the handle of the Plough/Big Dipper and you'll notice that it's an obvious double star.

However, the bigger star Mizar is actually four stars while smaller star Alcor is two, all gravitationally bound.

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