Which nebula is cited as the earliest known object of its kind, observed by Chinese astronomers centuries ago?

Answer

The Orion Nebula (M42)

The Orion Nebula (M42) was observed by Chinese astronomers centuries ago, and sketches from the 10th century show awareness of this fuzzy patch in Orion’s sword long before modern cataloging efforts.

Which nebula is cited as the earliest known object of its kind, observed by Chinese astronomers centuries ago?
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