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  2. Nebula - Wikipedia

    en.wikipedia.org/wiki/Nebula

    The term was coined by Steve Mandel who defined them as "high galactic latitude nebulae that are illuminated not by a single star (as most nebula in the plane of the Galaxy are) but by the energy from the integrated flux of all the stars in the Milky Way. As a result, these nebulae are incredibly faint, taking hours of exposure to capture.

  3. Planetary nebula - Wikipedia

    en.wikipedia.org/wiki/Planetary_nebula

    NGC 6326, a planetary nebula with glowing wisps of outpouring gas that are lit up by a binary [3] central star. 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 ...

  4. List of NGC objects - Wikipedia

    en.wikipedia.org/wiki/List_of_NGC_objects

    The following is a list of NGC objects, that is objects listed in the New General Catalogue (NGC). It is one of the largest comprehensive astronomical catalogues for deep sky objects such as star clusters, nebulae, and galaxies.

  5. List of largest nebulae - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_nebulae

    Soul Nebula: 330 ly (100 pc) [29] H II region: Heart Nebula: 330 ly (100 pc) [30] H II region: Has been named the “Heart nebula” because of its resemblance to a human heart. Henize 70 (N70 or DEM L301) [31] 300 ly (92 pc) [32] H II region: The N 70 Nebula, in the Large Magellanic Cloud has a shell structure and is really a bubble in space.

  6. Integrated Flux Nebula - Wikipedia

    en.wikipedia.org/wiki/Integrated_flux_nebula

    The term was coined by Steve Mandel who defined them as "high galactic latitude nebulae that are illuminated not by a single star (as most nebula in the plane of the Galaxy are) but by the energy from the integrated flux of all the stars in the Milky Way. As a result, these nebulae are incredibly faint, taking hours of exposure to capture.

  7. Whirlpool Galaxy - Wikipedia

    en.wikipedia.org/wiki/Whirlpool_Galaxy

    The Whirlpool Galaxy, also known as Messier 51a (M51a) or NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. [6] [7] [8] It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. [9]

  8. Boötes Void - Wikipedia

    en.wikipedia.org/wiki/Boötes_Void

    An image of Barnard 68, a dark nebula mistakenly used to refer to the Boötes Void.. The Boötes Void has been often associated with images of Barnard 68, [7] a dark nebula that does not allow light to pass through; however, the images of Barnard 68 are much darker than those observed of the Boötes Void, as the nebula is much closer and there are fewer stars in front of it, as well as its ...

  9. Serpens–Aquila Rift - Wikipedia

    en.wikipedia.org/wiki/Serpens–Aquila_Rift

    The Serpens–Aquila Rift is at 40° galactic longitude, from the center moving outwards to top-right. The Milky Way as seen by Gaia, with prominent dark features labeled in white, as well as prominent star clouds labeled in black. Main dark nebulae of the Solar apex half of the galactic plane, with the Aquila Rift on the right