This is the Gum Nebula and Vela Supernova Remnant shot at the Winter Star Party 2009 with a 200mm f:2.8 Canon EF @ f:2.8, ISO 2000, 6x5mins, Deep Sky Stacker, Pixinsight, PS CS3.

A bit less technical now, it's a picture of a small part of the sky in the direction of the constellation Vela. The big loop/filamentary like structure, red/green, is the mark of a supernova which exploded about 14000-20000 yrs ago (depending on whom you ask). The rest of the red stuff are glowing clouds of H gas, stellar nurseries, called diffuse emission nebulae. Also, every single point in this picture is a star in our own galaxy, the Milky Way.