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Messier 21 or M21, also designated NGC 6531 or Webb's Cross, is an open cluster of stars located to the north-east of Sagittarius in the night sky, close to the Messier objects M20 to M25 (except M24). It was discovered and catalogued by Charles Messier on June 5, 1764. [7] This cluster is relatively young and tightly packed.
The Messier catalogue is one of the most famous lists of astronomical objects, and many objects on the list are still referenced by their Messier numbers. [1] The catalogue includes most of the astronomical deep-sky objects that can be easily observed from Earth's Northern Hemisphere; many Messier objects are popular targets for amateur ...
Messier 56 (also known as M56 or NGC 6779) is a globular cluster in the constellation Lyra. [ a ] It was discovered by Charles Messier in 1779. [ b ] It is angularly found about midway between Albireo (Beta (β) Cygni) and Sulafat (Gamma (γ) Lyrae).
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 ]
Messier 23, also known as NGC 6494, is an open cluster of stars in the northwest of the southern constellation of Sagittarius. [7] It was discovered by Charles Messier in 1764. [ a ] [ 3 ] It can be found in good conditions with binoculars or a modestly sized telescope . [ 3 ]
The cluster is located near some obscuring features, with a dark lane passing near the center. [7] M25 is at a distance of about 2,000 light-years away from Earth and is 67.6 million years old. [2] The spatial dimension of this cluster is about 13 light-years across. It has an estimated mass of 1,937 M ☉, of which about 24% is interstellar ...
Panoramic image of the center of the nebula, taken by the Hubble Telescope. This view is about 2.5 light years across. The Trapezium is at center left. Interstellar clouds like the Orion Nebula are found throughout galaxies such as the Milky Way. They begin as gravitationally bound blobs of cold, neutral hydrogen, intermixed with traces of ...
Messier 69 or M69, also known NGC 6637, and NGC 6634, [9] [10] is a globular cluster in the southern constellation of Sagittarius. [a] It can be found 2.5° to the northeast of the star Epsilon Sagittarii and is dimly visible in 50 mm aperture binoculars. The cluster was discovered by Charles Messier on August 31, 1780, the same night he ...