A nebula produced by a proto-star. The unusual nebula may be formed by gas jets streaming away from the star or by bombardment from the star's jets.
- ^ Baumann, Mary K.; Will Hopkins, Loralee Nolletti, Michael Soluri, Steven Hawking (foreword) and Ray Villard (astronomy consultant) (2007). Cosmos: Images From Here to the Edge of the Universe. London: Duncan Baird Publishers. ISBN 1844834761 Check
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| group3 = Types of dark matter | abbr3 = 3 | list3 =</div>
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