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UranometriaDeep Sky Field Guide Planetary Nebulae will usually appear to “blink” as the stars are dimmed, and the nebula retains it brightness. There are a few planetaries that have weak [OIII] emission (a br
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Document Date: 2008-10-30 00:00:21
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UranometriaDeep Sky Field Guide Planetary Nebulae will usually appear to “blink” as the stars are dimmed, and the nebula retains it brightness. There are a few planetaries that have weak [OIII] emission (a br