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Evening star
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Solar Impulse
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Bone density
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Saline aquifer
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Aneurysm
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Radio telescope
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Denaturation
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Epinephrine
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Argos
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Thermal insulation
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Class I anti-arrhythmic
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Protease
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Landscape charter
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Semelparity
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Varroa
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Montreal Protocol
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Europa
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Pigment
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Ribonucleoside monophosphate
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Dabbling duck
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Fatty acid ethyl ester
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Pacific rosewood
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Einstein's box
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Ginger
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Field elm
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CD-R
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AIDS
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Adduction
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Optical isomers
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Selenocysteine
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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