March 16
Supernova Didius
Observed in 2012
Supernova Didius, named after a Roman emperor, is the white dot in the center of this image. The bright blob at upper left is the core of the supernova's host galaxy. The supernova is so far away, we see it as it appeared 7 billion years ago.
Image credit: NASA, ESA, Hubble Space Telescope