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If I can see the Eskimo, can I see galaxies?

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There is also one factor - surface brightness. Most of small planetary nebulas have very high surface brightness (O-III is glowing there like crazy). So compare surface magnitude with the given "standard" magnitude for the object. For planetary nebulas surface brightness is high, while the standard brightness is low (so such nebula is prominent vs the background). You should be able to see all galaxies that have high surface brightness, or those that in general are bright (like Andromeda).

Edited by riklaunim
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