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200-inch telescope 30 million light accuracy accurately antimatter astronomical unit boundary brightest galaxy brightest stars calibration called Cepheid variable clus cluster of galaxies collision cosmological model cosmologists cosmology distance scale distance-scale distant clusters distant galaxies doppler effect earth earth's orbit elliptical galaxies emitted energy entire universe ergs expansion explosion extremely farther finite flat Galaxy Figure galaxy NGC gas and dust gas clouds geometry Hyades cluster infinite instance irregular galaxy large distance Large Magellanic Cloud large number look luminosity main sequence matter measure its distance measure the distances miles per second moon more-distant most-distant motions nearby galaxy nucleus observable universe observatory parallax photograph physical planets possible quasars radar radial velocity radiation radio galaxies radius red shift solar system space spectra spectrum spiral arms spiral galaxies structure supernova tances thing tion types of stars velocity of light verse Virgo cluster wavelength young stars