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Glial cells
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Isthmus
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Renewable energy
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P2P
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Paramagnetic
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Baseline
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Permafrost
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Homo erectus
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Ring of fire
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Shale gas
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Bird call imitation
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Antitussive
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Zune
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Algae
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Threshold dose
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Accretionary prism
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Hydrophile
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Native Command Queuing
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Special conservation zone
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Calcification
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Host
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Motor neurone
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Rhizome
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CFC
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Arctic
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Speciation
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Web of Trust
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e-Couponing
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Anorexigen
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Ecological continuum
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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