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Parasite
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Primitive filter
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Anabolism
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MIDI
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Testis
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SPOT 5
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Corpuscle
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Rhizoid
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Jejunum
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CME
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Microdiorite
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Pregnancy
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Key escrow
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Sundancer
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RFT
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IBA
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Honey locust
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Anticancer agents
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Orion
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SQLite
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Calvin cycle
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Precious stone
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Eczema
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Catalase
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Dendroenergy
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Resistivity
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Anticyclonic circulation
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Stephan's quintet
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IPSec
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Gravitation
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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