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angular arc seconds asteroids astronomical units atoms axis binary star black hole body bright brightest star celestial object celestial pole celestial sphere centre century cloud cluster colour comet component constellation craters degrees density detected diameter disc discovered distance dust dwarf star Earth Earth's atmosphere eclipse ecliptic electromagnetic emission emitted energy equator galactic giant giant star gravitational Greeks helium hemisphere hydrogen infra-red interstellar Jupiter known light luminosity lunar magnetic field magnitude main sequence Mars mass measured Mercury meridian meteor Moon Moon's motion moving Nebula Neptune Observatory observed open cluster optical orbit parallax parsecs particles period photographs planet planetary polar pulsar radiation radio source radio telescope reflecting telescope region ring rotation satellite Saturn solar system southern space spacecraft spectral spectrum star's stellar stellar evolution Sun's supernova temperature theory tion universe Uranus variable stars velocity Venus visible wavelengths white dwarf X-ray