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Antiparticle
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pH
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Speckled wood
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Asian black bear
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Star
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Ovariectomy
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Electronic configuration
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Bio-accumulation
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Bar
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Dolerite
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Greenhouse gas
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Push
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Planck length
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Tiagabine
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Segregation
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Ecchymosis
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Amylose
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Podzol
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Clavicle
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Brown dwarf
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Jupiter
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Tau neutrino
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Cluster
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Glabella
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3G
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Focal length
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Supergiant star
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Tulip tree
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Data concentrator
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Salmonellosis
M2
M2, which is the second object in the Messier catalogue, is a globular cluster in the constellation of Aquarius. Discovered by Maraldi in 1786, it has about 150,000 stars and is very dense.
It can be seen with the naked eye in a clear sky; its apparent diameter is equivalent to half a full Moon.
Picture taken using a CCD camera and a 150 mm diameter telescope, by "Chamois" (the person's pseudonym on the forum)
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