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  2. Omega Nebula - Wikipedia

    en.wikipedia.org/wiki/Omega_Nebula

    The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. [3] The total mass of the Omega Nebula is an estimated 800 solar masses. [4]

  3. Caldwell catalogue - Wikipedia

    en.wikipedia.org/wiki/Caldwell_catalogue

    Iris Nebula: Open Cluster and Nebula: 1.4 Cepheus: 7 C5 IC 342: Hidden Galaxy [7] Spiral Galaxy: 10,000 Camelopardalis: 9 C6 NGC 6543: Cat's Eye Nebula: Planetary Nebula: 3 Draco: 9 C7 NGC 2403 Spiral Galaxy: 14,000 Camelopardalis: 8.4 C8 NGC 559 Open Cluster: 3.7 Cassiopeia: 9.5 C9 Sh2-155: Cave Nebula: Nebula: 2.8 Cepheus: 7.7 C10 NGC 663 ...

  4. List of diffuse nebulae - Wikipedia

    en.wikipedia.org/wiki/List_of_diffuse_nebulae

    Omega Nebula; Orion Nebula; Pistol Nebula ... Soul Nebula; Tarantula Nebula; Trifid Nebula; Witch Head Nebula; Messier 43; Messier 78, reflection nebula; NGC 248 ...

  5. Gum catalog - Wikipedia

    en.wikipedia.org/wiki/Gum_catalog

    Sh2-6, NGC 6302, Bug Nebula, PK 349+01 1, Butterfly Nebula, RCW 124, Caldwell 69 Gum 64: NGC 6334: ESO 392-EN 009, Sharpless 8, RCW 127, Gum 64, NGC 6334 Gum 66: NGC 6357: Sh2-11, NGC 6357, RCW 131, Gum 66, War and Peace Nebula Gum 72: Lagoon Nebula: Sh2 25, RCW 146, Gum 72, Messier 8 Gum 76: Trifid Nebula: Sh2 30, Messier 20, NGC 6514, RCW 147 ...

  6. Portal:Astronomy/Picture/Week 23 2010 - Wikipedia

    en.wikipedia.org/wiki/Portal:Astronomy/Picture/...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  7. Small Sagittarius Star Cloud - Wikipedia

    en.wikipedia.org/wiki/Small_Sagittarius_Star_Cloud

    The location of the Small Sagittarius Star Cloud is near the Omega Nebula (also known as M17) and open cluster Messier 18, both north of M24. M24 is one of only three Messier objects that are not actual deep sky objects. [6] M24 fills a space of significant volume to a depth of 10,000 to 16,000 light-years.

  8. Messier object - Wikipedia

    en.wikipedia.org/wiki/Messier_object

    For example, Messier 1 is a supernova remnant, known as the Crab Nebula, and the great spiral Andromeda Galaxy is M31. Further inclusions followed; the first addition came from Nicolas Camille Flammarion in 1921, who added Messier 104 after finding Messier's side note in his 1781 edition exemplar of the catalogue.

  9. Messier 18 - Wikipedia

    en.wikipedia.org/wiki/Messier_18

    Messier 18 or M18, also designated NGC 6613 and sometimes known as the Black Swan Cluster, is an open cluster of stars in the constellation Sagittarius. It was discovered by Charles Messier in 1764 and included in his list of comet -like objects. [ 8 ]