Newly discovered planet has triple sunrises, sunsets

Imagine a planet with triple sunrises and sunsets every day for part of the year, and nonstop daylight at other times.

Astronomers revealed such a place Thursday: a strange new world in the Constellation Centaurus that has not one, not two, but three suns. What’s more, a year there lasts half a millennium from Earth’s perspective.

Discoverer and lead author Kevin Wagner said he’s thrilled “to have seen such a beautiful part of nature that nobody else has seen.”

As amazing as three sunsets and sunrises are, “I think nature will have some other surprises in store for us as we continue exploring,” Wagner, a doctoral student at the University of Arizona at Tucson, said via email.

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.

Its orbit is double Pluto’s — or roughly 550 Earth years. That’s how long it takes to orbit its system’s brightest star, a super-size sun. The two smaller stars orbit one another and, as a pair, orbit with their big stellar brother.

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