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Photosphere
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Noctilucent cloud
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The pill
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Whopping cough
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Contraceptive patch
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Dietary supplement
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Sunyaev-Zel'dovich effect
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IUCN
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M 66
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Pandiculation
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Brazing
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Secondary
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Kilo base
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Temperate forest
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Porosity
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Dolerite
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Saproxlyic
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Mars
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Pedicellariae
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Apparent magnitude
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Transferase
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Extrasystole
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Phosphorylated molecule
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Chayote
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Sewage sludge
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Exoplanet
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MPEG
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Coal
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DES
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Fluid inclusion
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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