low-surface-brightness galaxy
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low-surface-brightness galaxy
[‚lō ′sər·fəs ‚brīt·nəs ‚gal·ik·sē] (astronomy)
A galaxy whose spatial density of stars is so low that it is almost invisible.
Also found in: Wikipedia.
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TRANSPARENCY TEST Despite how they look in photos (left), the star cluster NGC 6939 in Cepheus is easier to see in the eyepiece than the face-on, low-surface-brightness galaxy NGC 6946.
For a good view of this large, low-surface-brightness galaxy, be sure to center it in your field of view.
It's easy to assume that, sharing the same high-power field with M57, IC 1296 would be well known, but I've pointed it out to several experienced observers who were unaware of this small, low-surface-brightness galaxy. The oversight is understandable, since the legendary deep-sky explorers William Herschel and his son, John, missed it.
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