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Variable nebula
Variable nebulae
are
reflection nebula
e that change in brightness because of changes in their 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