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General astronomy
Industry: Astronomy
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General astronomy
argon (Ar, 1S0 in ground state)
Astronomy; General astronomy
colourless, odourless gas comprising 1% of the atmosphere
argument of the perihelion (ω, longitude of the perihelion)
Astronomy; General astronomy
Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.
array telescope
Astronomy; General astronomy
a telescope composed of an array of separete individual elements acting in concert
arsenic (As, 4S3/2 in ground state)
Astronomy; General astronomy
a metalloid element with two main forms, grey α arsenic and β arsenic
alpha Centauri (Rigil Kent, HR 5459)
Astronomy; General astronomy
A binary star whose components have G2 V and K5 V spectral types. The nearest star system to the Sun and the third brightest star in the night sky.
30 Doradus Nebula (NGC 2070, Great Looped Nebula, Tarantula Nebula)
Astronomy; General astronomy
A giant H II region, at least 300 pc across - one of the largest known. It is larger and more luminous than any known in the Galaxy. It is the brightest object in the Large Magellanic Cloud at both ...
