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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 coma comet component condensation constellation contains Corona craters cycle density diameter distance Earth ecliptic elliptical energy event horizon evolution flanked focal length galactic globular clusters gravitational H-R diagram helium Hubble hydrogen Jupiter km/s known Lacaille lens lies between RA light years distant located lt lies luminosity main sequence Mars material measured Mercury meteorites mirror Moon motion moving nebulae neutron nucleus object observed open clusters orbit outer particles perihelion phenomena planet planetary pole position radiation radio radius reflector refractor region respectively rotation satellites Saturn seen Serpens solar masses solar system space spectral spectrum stellar classes surface synodic period telescope temperature universe Uranus Ursa variable velocity Venus visible white dwarf