Astronomers believe they have discovered a supernova at least twice as bright as anything previously recorded.
A supernova is an explosion that occurs at the end of a dying, powerful star. It is thought that some of the largest develop into black holes.
The scientists believe the light was actually the result of two huge stars, which merged before exploding.
An event like this only existed in theory and has never been confirmed through astronomical observations.
The explosion occurred 4.6 billion light-years from Earth and was so bright it had hidden the surrounding galaxy.
The team of scientist which made the find were from Harvard and Ohio University and had been watching the area two years.