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absolute mag absolute magnitude amateur Andromeda angle angular arms astronomical atmosphere binary black hole brightest star Carina celestial equator celestial sphere cent centre Cepheid cloud collapse comet component condensation constellation contains Corona craters cycle density diameter distance Earth ecliptic elliptical energy event horizon evolution flanked focal length galactic galaxy globular clusters gravitational H-R diagram helium hydrogen Jupiter km/s lens lies between RA light years distant located lt lies luminosity main sequence Mars material measured Mercury meteorites mirror Moon motion moving Nebula neutron nucleus object observed open clusters orbit outer particles perihelion phenomena planet planetary Pluto pole position radiation radio radius reflector refractor region rotation satellites Saturn Serpens solar masses solar system solar wind space spectral spectrum spiral stellar classes surface synodic period telescope temperature Triangulum universe Uranus Ursa variable velocity visible white dwarf