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The Eta Carinae nebula, NGC3372, also known as the Keyhole Nebula, as seen by the CTIO Curtis Schmidt telescope in 1975. This gaseous bright nebula surrounds the peculiar variable star Eta Carinae, with overlying clouds of dark material, at a distance from Earth of about 9000 light years. North is at the top. Minimum credit line: AURA/NOAO/NSF (for details see Copyright Statement)