The HR5171A, a massive bright yellow star that is 1,300 times the diameter of the sun, has been discovered by an international team of astronomers, they said it's the largest star that has ever been discovered. The hypergiant star is a very close partner, the stars as in the below picture are really touching and that is why it forms a binary system that looks more like the shap of a distorted peanut. The stars are in an eclipsing formation, in which the smaller star passes the front and behind the other one's (larger one) orbit. This happens in every 1,300 days.
HR5171A has been on observation over the past 40 years and have been observed by astronomers that the HR5171A has been getting bigger, and cooler as it grows. Astronomers says the star is about one million times bigger than the sun and it measures a 1.2 billion miles in diameter.
The system is located at about 12,000 light years away, but it's bright enough that it can be made out with the naked eyes. Astronomers have known about the hypergiant star for dacades, but recent observations researched by the ESO's Very Larg Telescope (VLT) have resulted a stretched out result.
Yellowed coloured hypergiants are very rare, astronomers have only been able to record about a dozen. They are among the brightest and biggest stars in the cosmos, and at a certain stage in their life becomes unstable as result, star to deteriorate and expels materials outward that forms a large extended atmosphere around the star.
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