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Coalsack Nebula

Nebula in Crux · 600 light-years

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TypeNebula
ConstellationCrux
Distance600 light-years
Apparent size420′ (arc-minutes)
Also known asC99 · Caldwell 99
Caldwell 99, the Coalsack, is the most prominent dark nebula in the sky — a dense cloud of interstellar dust about 600 light-years away that blots out the star-clouds of the southern Milky Way beside the Southern Cross. To the unaided eye it appears as a striking inky void, and many southern-hemisphere cultures wove it into their sky lore. Unlike glowing nebulae it emits no light of its own; we see it purely as a silhouette. It appears as number 99 in Sir Patrick Moore's Caldwell catalogue.

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