To see the unprotected eye in the sun on a clear summer day is almost impossible: his luminosity is too large for our vision. But in the universe there are stars, the luminosity of which is many times higher than solar. The record holder is a double star called "This Kiel", located 7500 light years from the ground.
A double star is a system of two stars, gravitational interacting between each other. The main star of the double system This keel is a hypergigant, the mass of which is about 200 solar, which is close to theoretically acceptable limit. The second star, the mass of which is about 3 times less, is distinguished by the extremely high surface temperature.
But the main feature of "this keel" is an extremely bright luminosity, which is a million times higher than solar. And this is the assessment of only the first - the biggest star in the system. Estimate the luminosity of the second object of the system is difficult due to partially hiding its nebula. At the moment, the double star "this keel" is the brightest of all known.
But you should not try to find it at the night sky: the light emitted by the system is absorbed by the nebula of the homunculus. However, once in the history of astronomical observations, "this keel" became for earthlings the second in brightness star after the sun. It happened in the first half of the 19th century, when a powerful flash took place in the system, and the star became visible to the naked eye. After some time, "this keel" again disappeared from the sight of a person.
Such a high luminosity system generates the strongest expiration of the stellar substance into space. This leads to a quick loss of mass, so the lifetime of "this keel" is short enough compared, for example, with our sun.
Astronomers believe that at the end of his life "this keel" will turn into a supernova, temporarily increasing its brightness several times and throwing a huge amount of substance into outer space and producing a powerful gamma splash. According to cosmic standards, "this keel" is located quite closely from our planet, and if the emission is sent to our side, life on earth may be at risk.
Illustration: Depositphotos | Kevron2002