Sh2-173 is a faint emission nebula in the constellation Cassiopeia. It’s called the Phantom of the Opera Nebula because of the way the black dust lanes cut across the brighter hydrogen making it resemble a theatrical mask.
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A hobbyist with sleep issues practicing astrophotography direct from my backyard in cloudy SW Ontario🇨🇦🔭. Not A.I. www.astrobin.com/users/Baro2n
