A large area of nebulosity in the direction of the Lagoon nebula. (galaxymap.org)
Whether he's discussing the derivation of a star's name, traced back many centuries into the past, or conveying the appearance of a delicate wisp of nebulosity in a remote stellar nursery, Robert Burnham illuminates his subjects as few other astronomy writers have, before or since. (frostydrew.org)
The young open cluster NGC 6530 associated with the Lagoon Nebula M8 was classified as of Trumpler type «II 2 m n» (see e.g. the Sky Catalog 2000), meaning that it is detached but only weakly concentrated toward its center, its stars scatter in a moderate range of brightness, it is moderately rich (50 — 100 stars), and associated with nebulosity (certainly, with the Lagoon nebula). (maa.clell.de)