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THE PLANET, CALLED HD 131399Ab, TAKES ABOUT 550 EARTH-YEARS TO ORBIT ITS BIGGEST STAR
AROUND HALF THE TIME, ALL THREE STARS ARE VISIBLE IN THE SKY AT THE SAME TIME
FOR THE OTHER HALF OF THE 550-YEAR ORBIT, THE SUNS SET AND RISE AT DIFFERENT TIMES
WHICH YIELDS CONSTANT DAYTIME
ASTRONOMERS SPOTTED IT WITH THE VERY LARGE TELESCOPE IN CHILE
320 light years away, astronomers have spied an exotic planet in a rare triple star system.
HD 131399 Ab is the youngest exoplanet discovered so far (only 16 million years old), and is estimated to weigh as much as four Jupiters.
The planet and constellation Centaurus.
It is the second triple-star planet ever discovered and has one of the strangest orbits ever seen It circles between a large star and two smaller ones.
Astronomers assumed that planets influenced by three stars would be unstable due to competing gravitational pulls on their orbits
The brightest of the three stars in the system, HD 131399A, is eighty percent larger than our Sun.
The planet's orbit around this star is twice the distance between our Sun and Pluto, meaning a single revolution takes 550 Earth-years.
The two smaller stars, B and C, twirl around each other and also orbit the brightest star.
Planet HD 131399Ab is exotic for now-but there could be many others like it.