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  2. Emission nebula - Wikipedia

    en.wikipedia.org/wiki/Emission_nebula

    Planetary nebulae, represented here by the Ring Nebula, are examples of emission nebulae. An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star.

  3. List of diffuse nebulae - Wikipedia

    en.wikipedia.org/wiki/List_of_diffuse_nebulae

    This is a list of diffuse nebulae. Most nebulae are diffuse , meaning that they do not have well-defined boundaries. Types of diffuse nebulae include emission nebulae and reflection nebulae .

  4. Category:Emission nebulae - Wikipedia

    en.wikipedia.org/wiki/Category:Emission_nebulae

    This is a diffusing subcategory of Category:Nebulae. Articles about emission nebulae in the parent category should be moved to this subcategory. Wikimedia Commons has media related to Emission nebulae .

  5. N44 (emission nebula) - Wikipedia

    en.wikipedia.org/wiki/N44_(emission_nebula)

    N44 is an emission nebula with superbubble structure located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way in the constellation Dorado. [ 3 ] [ 4 ] [ 5 ] Originally catalogued in Karl Henize 's "Catalogue of H-alpha emission stars and nebulae in the Magellanic Clouds" of 1956, it is approximately 1,000 light-years wide and ...

  6. Planetary nebula - Wikipedia

    en.wikipedia.org/wiki/Planetary_nebula

    A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. [ 4 ] The term "planetary nebula" is a misnomer because they are unrelated to planets .

  7. NGC 6164 - Wikipedia

    en.wikipedia.org/wiki/NGC_6164

    NGC 6164, known as the Dragon's Egg Nebula, [1] [2] is an emission nebula located in the constellation Norma.The nebula was discovered by astronomer John Herschel in 1834, and is approximately 3,870 light years from the solar system.

  8. NGC 2032 - Wikipedia

    en.wikipedia.org/wiki/NGC_2032

    NGC 2032 (also known as ESO 56-EN160 and the Seagull Nebula) is an emission nebula in the Dorado constellation and near the supershell LMC-4 [2] and it consists of NGC 2029, NGC 2035 and NGC 2040. It was first discovered by James Dunlop on 27 September 1826, and John Herschel rerecorded it on 2 November 1834. [3]

  9. Heart Nebula - Wikipedia

    en.wikipedia.org/wiki/Heart_Nebula

    The Heart Nebula (also known as the Running Dog Nebula, Sharpless 2-190) is an emission nebula, 7,500 light-years (2,300 pc) away from Earth and located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It was discovered by William Herschel on 3 November 1787. [1] It displays glowing ionized hydrogen gas and darker dust lanes. [2]