... The Long Jet of the Lighthouse Nebula . ... Yes, but how many dark clouds have a multicolored lining? ... The Cosmic Web of the Tarantula Nebula . ... This tarantula, however, is about 1,000 light-years across. ... This helmet-shaped cosmic cloud with wing-like appendages is popularly called Thor's Helmet. ... Sprawling across almost 200 light-years, emission nebula IC 1805 is a mix of glowing interstellar gas and dark dust clouds about 7,500 light-years away in the Perseus spiral arm of our galaxy....