The Arches Cluster, an open cluster in Sagittarius constellation discovered in 1995, is the densest cluster of its kind known in the Milky Way. It lies at a distance of 25,000 light years from Earth and only about 100 light years from the centre of the Milky Way.
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The Quintuplet Cluster is a dense open cluster located at a distance of 26,000 light years from Earth in the direction of Sagittarius constellation and only about 100 light years from the Galactic centre.
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The Pistol Star, also known as V4647 Sagittarii, is a blue hypergiant star located about 25,000 light years from Earth in the constellation Sagittarius. It is a candidate luminous blue variable (cLBV) and one of the most luminous stars known, with a luminosity 1,600,000 times that of the Sun.
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