Astronomers have found extremely distant supernovae and which have been labelled to be of a new class of stellar explosion.
One of these explosions occurred when the universe were merely 4 billion years old.
The energy produced in these explosions are extremely large to be seen over such distance.
The distance were finally confirmed when it were found that the light from the ultraviolet part of the spectrum had been redshifted to visible wavelengths.
http://www.news.ucsb.edu/2013/013826/powerful-ancient-explosions-explain-new-class-supernovae
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