The Veil Nebula, Cygnus

The remnants of an estimated 20-solar mass star that suffered catastrophic core collapse in a brilliant supernova explosion 10,000 to 20,000 years ago. It was likely brighter than Venus, visible during the day and the shell(s) of wreckage have continued to expand into space at 1.5 million km/hr ever since to achieve its currently measured diameter of 130 ly. This expansion was confirmed photographically by the Hubble Space Telescope when images taken in 1997 and 2015 were compared. 

It is a relatively difficult object to image well from the latitudes of southern Australia as it never rises much more than 20^o above the northern horizon. Nevertheless, the essential details of the nebula are present in the image - the Eastern Veil (left). Western Veil (right) and Pickering's Triangle - defined in the colours of hydrogen (red) and oxygen (blue-green). Astrometrically determined distance is 2,400 ly.