Variable nebula

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image of NGC 2261, a classic example of a variable nebula. Variable nebulae are reflection nebulae that change in brightness because of changes in their illuminating star.

image of NGC 2261, a classic example of a variable nebula.]] Variable nebulae are reflection nebulae that change in brightness because of changes in their illuminating star. ==See also== McNeil's Nebula NGC 1555 (Hind's Variable Nebula) NGC 2261 (Hubble's Variable Nebula) NGC 6729 (R Coronae Australis Nebula) ==References== ==External links== Astrobiscuit: Seeing The Speed Of Light fun and educational video about variable nebula and the amateur community observing them

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