The Gum Nebula is a huge constellation in the Southern hemisphere, about 1000 light years away, and extending over at least 40 degrees of the sky. The Gum Nebula is thought to be the remnant of one or more ancient supernovae. One pulsar in this region, perhaps not associated with the Gum Nebula, is the Vela Pulsar, which is about 800 light years away and estimated to be about 11,000 years old.