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Brine
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Certification
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Moulting
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Bryophyte
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Cherenkov radiation
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Vitamin B1
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Deforestation
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Tibia
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Spermogenesis
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Wi-Fi
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Reverse engineering
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Pop-up
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Hot Jupiter
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Lymph
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Crenellation
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ArXiv
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Source code
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Chelating agent
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Unbundling
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Propagule
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Mach number
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Sea-green
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ONCFS
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Retina
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Ring Nebula
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Fast neutron reactor
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Confocal laser scanning microscope
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Waste-to-energy
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High energy performance
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Gauge fields
M20
Messier 20 is one of the most photogenic diffuse nebulae. It is situated in the constellation of Sagittarius. It is in the shape of a three petalled flower, gaseous lobes separated by dark filaments. The red nebula is surrounded by another blue one that can be seen on one side.
The nearby Messier 31 open cluster completes this superb picture.
A 2-hour exposure with a digital reflex camera and a 200 mm diameter telescope by "Chamois" (the person's pseudonym on the forum).
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