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Chardonnay
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Hash function
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Xerophile
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Chromatography
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Echolalia
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Constellation of Draco
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M108
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Postulate
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Channel
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Circuit switched connection
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Carbonado
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Tanne inclusion
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PSA
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Giant star
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Duchenne myopathy
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Tautomer
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Main sequence
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Secondary
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Azotaemia
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St Lucie cherry
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Port
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Almond
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Geophyte
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Sex chromosome
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Coupled reactions
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API
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Monoethanolamine
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Perching
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SPOT
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Speleology
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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