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Bioavailability
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Arginine
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Turnip
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Andesitic
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SALT
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Red Spot Junior
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Alula
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Planck time
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Xylene
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Wavenumber
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Iron bloom
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Reverse engineering
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Crystal face
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Douglas fir
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Catalytic site
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Equation
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Bearded seal
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Ambulatory
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Cervical smear
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Sialidase
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Collenchyma
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OB association
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Asteroid belt
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Chemoprevention
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Entropy
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Lysine
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Macrophage
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Ecological corridor
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OMZ
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Achromatopsia
The Dumbbell nebula
This was the first nebula discovered by MESSIER in 1764.
It also looks like an apple core; what can be seen is the gaseous envelope ejected by a dying star in the centre of the nebula.
M27 is a remarkable object through a pair of binoculars because of its apparent size (half a full Moon) and its brightness (magnitude 7.4).
This is a 35 minute exposure photograph using a CCD camera behind a 15 cm telescope. picture by Chamois.
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