Assertion: celestial sphere's star | /r/HasProperty | messier
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Source sentences:
text: Other notable deep sky objects in the area include the double star Messier 40 (Winnecke 4), the spiral galaxy Messier 81 (Bode’s Galaxy), the irregular galaxy Messier 82 (Cigar Galaxy), the planetary nebula Messier 97 (Owl Nebula), and spiral galaxies Messier 108 and Messier 109.