Gum Nebula (Gum 56)
The Gum Nebula is believed to be the hugely expanded (and still-expanding, at 20 km/s) remains of a supernova that took place about a million years ago. It contains the Vela OB2 Association, the hot stars of which (among them, Naos) cause it to shine. Also embedded in the Gum are the Vela Supernova Remnant and the Vela Pulsar, though both these are very much younger.
It is named after its discoverer, the Australian astronomer Colin Stanley Gum (1924–1960), who published his findings in 1955.
Related category• NEBULAE AND STAR CLUSTERS
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