October 2012 - A spiral galaxy with an explosive secret This
spiral galaxy was discovered back in the nineteenth century, but
in 2008 it became a prime target for observations thanks to the
violent demise of a white dwarf star. The supernova known as
SN2008a was spotted in the galaxy and briefly rivalled the
brilliance of its entire host galaxy. But, despite the energy of
the explosion, it had already disappeared by the time this
Hubble image was taken, around a year and a half later. This
calendar is not available for sale. ESA/Hubble and NASA