This comet discovered by astronomers Pedro Bernardinelli and Gary Bernstein has a nucleus of diameter 128 km. It was discovered in 2014 and was confirmed by the Hubble telescope; It is the largest comet ever found.
Bernardinelli-Bernstein
This comet is known as C/2014 UN271 and it is the biggest known comet in our solar system. But this comet cannot be seen by the naked eye because it is very far from our home planet and will not enter the inner Solar System. This massive comet made of originated in the Oort Cloud and is moving at an incredible speed of 22,000 mph; currently making its way towards our star. As far as the comet does not change its course of direction it will miss our home planet by a distance of 1,000,000,000 miles but a slightest might end up pretty bad for earth and its civilizations. Let hope and pray that the comet should not change its course. In 2031 this comet will makes its closest approach to earth.
Comet Comparison
The comet C/2014 UN271 which is also known as the Bernardinelli-Bernstein has a nucleus bigger than other known comets such as Halley's. In the picture below you can see the know nucleus sizes of the comets in our solar system. The mass of this icy rock is estimated to be a whooping 500 trillion tons.
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