... Tonight's Sky . ... Observing . ... Sky this Month . ... Star Atlas . ... Astronomy for Kids . ... Making of supernovae explained . ... A supernova observed last year was so bright--about 100 times as luminous as a typical supernova--that it challenged the theoretical understanding of what causes supernovae. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...