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Virtual reality
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Granulocyte
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Inductive effect
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ALT
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Limescale
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Synchrotron radiation
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Turbulence
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Phase transition
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Fibroblasts
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Plasmid
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H.261
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Mirror
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Hydroxyl radical
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Solar power station
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Sodium
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Titania
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Magnetic monopole
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Progestogen
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Archetype
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Arrhythmia
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Colour
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Undermining
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Optical isomers
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Sprain
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Fine particle
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Diaclase
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Coppice
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Allotransplantation
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Luminescence
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Papilio phorbanta
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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