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  2. 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.

  3. Messier 105 - Wikipedia

    en.wikipedia.org/wiki/Messier_105

    Messier 105 is known to have a supermassive black hole at its core whose mass is estimated to be between 1.4 × 10 8 and 2 × 10 8 M ☉. [11] The galaxy has a weak active galactic nucleus of the LINER type with a spectral class of L2/T2, meaning no broad Hα line and intermediate emission line ratios between a LINER and a H II region. [12]

  4. Messier 102 - Wikipedia

    en.wikipedia.org/wiki/Messier_102

    Messier 101 (also known as the Pinwheel Galaxy or NGC 5457) is a face-on spiral galaxy in the constellation Ursa Major. In a letter written in 1783 to J. Bernoulli , Pierre Méchain (who had shared information about his discoveries with Messier) claimed that M102 was actually an accidental duplication of M101 in the catalog.

  5. Charles Messier - Wikipedia

    en.wikipedia.org/wiki/Charles_Messier

    Charles Messier (French: [ʃaʁl me.sje]; 26 June 1730 – 12 April 1817) was a French astronomer. He published an astronomical catalogue consisting of 110 nebulae and star clusters , which came to be known as the Messier objects , referred to with the letter M and their number between 1 and 110.

  6. Messier 100 - Wikipedia

    en.wikipedia.org/wiki/Messier_100

    Messier 100 (also known as NGC 4321 or the Mirror Galaxy) is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices. [5] It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years [3] from our galaxy, its diameter being 107,000 light years, and being about 60% as large.

  7. New General Catalogue - Wikipedia

    en.wikipedia.org/wiki/New_General_Catalogue

    The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae.

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