The super-luminous supernova, called ASAS-SN-15lh, was discovered by the All Sky Automated Survey for SuperNovae team (ASAS-SN), an international collaboration at the Ohio State University in US, which uses a network of 14-centimetre telescopes around the world to scan the visible sky every two or three nights looking for very bright supernovae.
Supernovae are violent stellar explosions and some of the brightest objects in the universe. Human records noting their existence date back nearly 2,000 years. "We spotted a newly occurring explosion in a galaxy of an unknown distance", said Benjamin Shappee, from Carnegie Institution for Science.
The supernova's spectra matched that of other hydrogen-poor super-luminous supernovae. However, the researchers realised after further follow-up that it is two times more luminous than any supernova previously discovered.

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