The Vela Supernova Remnant in the centre of the Gum Nebula area of Vela. This is the remains of a star that exploded thousands of years ago.
The emission nebula at upper left is Gum 17, at centre left is Gum 18.
This is a stack of 10 x 12 minute exposures with the Borg 77mm astrographic apo refractor at f/4.3 (330mm focal length) and the filter-modified Canon 5D Mark II at ISO 800. The image has been highly processed in contrast to bring out the faint nebulosity and arcs of the remnant. Taken from Coonabarabran, Australia March 2014.
The Amazing Sky 