ANSWER: Supernova
Explanation:
Hubble Space Telescope has captured the image of the first every predicted supernova explosion offering scientists the capability of testing how mass- especially of dark matter- is distributed within the cluster of a galaxy. Few stellar explosions have been caught in the process and on December 11, astronomers not only caught the supernova in action, but also saw it was exactly when and where they predicted it would be for the first time. The supernova, nicknamed Refsdal, has been spotted in the galaxy cluster MACS J1149.5+2223. The supernova itself had exploded nearly 10 billion years ago.
