Assertion: celestial sphere's star | /r/Synonym | ngc 1981
Facets:
Source sentences:
text: Exploring further, located at the northernmost part of Orion’s Sword is a collection of reflection nebulae (NGC 1973, NGC 1975 and NGC 1977) which are collectively called The Running Man Nebula, while further north still is a loose cluster of around 20 stars called NGC 1981.