The Gum Nebula is an emission nebula that extends across 36° in the southern constellations Vela and Puppis. It lies roughly 350 parsecs from the Earth. Hard to distinguish, it was widely believed to be the greatly expanded remains of a supernova that took place about a million years ago.

Designations: Gum 12

Apparent magnitude (V): +12 (infrared only)

Absolute magnitude (V): 3.73 (infrared)

Distance: 1470 ly (450 pc)

Constellations: Vela, Puppis