[2] These dense cloud cores are subject to such strong radiation from O-type stars γ2 Vel and ζ Pup and formerly the progenitor of the Vela Supernova Remnant that the cloud cores evaporate away from the hot stars into comet-like shapes.

[4][5] The star cluster NGC 2547 formed 100 pc more distant than Vela OB2 and is an interloper.

[6] It is named after its discoverer, the Australian astronomer Colin Stanley Gum (1924–1960).

[7] The Gum nebula was photographed during Apollo 16 while the command module was in the double umbra of the Sun and Earth, using high-speed Kodak film.

[8] The Gum Nebula is explored by the crew of the Starship Titan in the Star Trek novel Orion's Hounds.