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Imagine a planet with triple sunrises and sunsets every day for part of the year, and nonstop daylight at other times.Triple-star systems with detected planets are rare enough; this is believed to be just the fifth such discovery. But the giant gassy world in this one – formally known as Planet HD 131399Ab – has the biggest known orbit in a multi-star system. Planet HD 131399Ab has four times the mass of Jupiter. With such a wide orbit and companion stars, scientists would expect a planet like this to be kicked out in a tug of stellar war. During part of the planet's orbit, all three stars are visible on the same day, offering triple sunrises and sunsets and allowing for day and night.
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