Messier 31 (M31), better known as the Andromeda Galaxy, is a large spiral galaxy located in the constellation Andromeda. Lying at a distance of 2.54 million light years from Earth, the Andromeda Galaxy is the nearest major galaxy to our own. It is on a collision course with our home galaxy, the Milky Way. Messier 31 has an apparent magnitude of 3.44. Its designation in the New General Catalogue is NGC 224.
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Messier 22 (M22) is a globular cluster located near the Milky Way bulge, the tightly packed group of stars near the galactic centre. The cluster lies in the constellation Sagittarius. It is one of the brightest globular clusters in the sky and was one of the first objects of this kind to be discovered and studied.
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Messier 15 (M15), also known as the Great Pegasus Cluster, is a globular cluster located in the northern constellation Pegasus. The cluster has an apparent magnitude of 6.2 and lies at a distance of 33,600 light years (10,000 parsecs) from Earth. It has the designation NGC 7078 in the New General Catalogue.
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