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Expectorant
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Ontogeny
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One-way hash
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Mesohaline water
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Regional metamorphism
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Mordanting
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Eligibility
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Office automation
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Precordial pain
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Beta lactam
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Antigen
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Hydrogeology
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SSL
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ATM
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Solar energy
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Cleavage
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Exoskeleton
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Ovulation test
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PM 10
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Tumour
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Ovary
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Salting out
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Actomyosin
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Tetrapod
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Bradycardia
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Leaching
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Stratification
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Plagioclasite
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Aircraft
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Google Bombing
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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