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Blinking Planetary

A Dictionary of Astronomy | 1997 | 265 words | Copyright

Blinking Planetary The planetary nebula NGC 6826 in Cygnus. It is an 8th-magnitude nebula with a 10th-magnitude central star. Alternately looking at the central star and then away causes the star and nebula to appear to blink on and off. It is about 3200 l.y. away.

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