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Answer   The 'New General Catalogue' was an update to Sir John Herschel's 'General Catalogue,' hence the name 'NGC'. Henry Dreyer and Annie Jump Cannon compiled the NGC i â¦ n the late 19th and early 20th century. This catalog, like its predecessor the GC, focused on cataloging the non-stellar deep sky objects found in astro-photographic plates.
Lambda is the term that represents what we now also call dark energy - it's the same thing. CDM refers to cold dark matter. There is more confidence about the dark matter part than about the cold part. Some kind of dark matter is postulated because it explains a few otherwise anomalous observations. The most famous and first one of these is the rotation curves of galaxies.