GUM Nebula: In the southern constellations of Vela and Puppis a very large nebula complex can be found, named after the Australian astromomer Colin Stanley Gum, the origin of which is believed to be a Super Nova explosion approx. one million years ago. Embedded in this vast complex is the Vela Super Nova Remnant from another explosion not so long ago.
This wide field image covers the central part of the complex with the Vela SNR visible in the upper central part of the photograph. The round emission nebula at the left hand edge of the image is GUM 14 (RCW 27) and the brighter smaller one nearby is GUM 17 (RCW 33). In the right lower corner a small nebula is visible, which is called the Pencil Nebula and the bright nebula close to it is GUM 23 (RCW 38).

For a higher resolved image of the Vela SNR see here.

The image was selected "Astrophoto of the Week" by astronomie.de