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

A Hubble Space Telescope image of NGC 2261, a classic example of a variable nebula.
See also
- McNeil's Nebula
- NGC 1555 (Hind's Variable Nebula)
- NGC 2261 (Hubble's Variable Nebula)
- NGC 6729 (R Coronae Australis Nebula)
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