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astrophysics
Astronomy; General astronomy
The science that studies the physics and chemistry of extraterrestrial objects. The alliance of physics and astronomy, which began with the advent of spectroscopy, made it ...
asymptotic branch star
Astronomy; General astronomy
Globular cluster stars, which are found in that part of the HR diagram that connects the top pf the giant tip with the horizontal branch stars.
atmophile element
Astronomy; General astronomy
volatile element that tends to be found in the atmosphere of a planet or asteroid
atmosphere
Astronomy; General astronomy
Mantle of gases round a star planet or moon, sometimes even forming the apparent surface of the body. For a body to retain an atmosphere depends on the body's gravity, and the ...
atmospheric dispersion corrector
Astronomy; General astronomy
An optical device usually comprising two thin prisms which can rotate to compensate for the elongation of a star image caused by the wavelength dependence of the refractive index ...
atmospheric extinction
Astronomy; General astronomy
Decrease in the intensity of light from a celestial body due to absorption and scattering by the Earth's atmosphere. The extinction increases from the zenith to the horizon and ...
