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Variable Nebulae: what they are and how to observe them - BBC Sky at Night Magazine
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Hanson Astronomy Photos-Hubble Veriable Nebula
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Hubble's Variable Nebula (NGC 2261) | HubbleSite
NGC 2261 - Hubble's variable nebula
HUBBLE: NEBULA. /nHubble's Variable Nebula (NGC 2261), illuminated by the star R Monocerotis. Imaged by the Hubble Space Telescope, c1999 Stock Photo - Alamy
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NGC 2261 - Wikipedia
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NGC 2261 - Wikipedia
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Hubble's Variable Nebula. A deep sky object that does something – British Astronomical Association
NGC 2261 - Hubble's Variable Nebula - Reflection Nebula | freestarcharts.com
Hubble's Variable Nebula, NGC 2261 | NOIRLab
