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WHAT lS THE UNlVERSE?
THE SlZE OF THE UNlVERSE
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35 million light accurately antimatter astronomical boundary Bright Faint brightest stars called Cepheid variable cluster of galaxies collision cosmological model cosmologists distance scale distant galaxies doppler effect doppler shift earth elliptical galaxies emission lines emit energy ergs expansion extremely farther finite Galaxy Figure galaxy NGC gas and dust gas clouds geometry Gravitational Hubble constant Hubble's law Hyades cluster idea infinite irregular galaxy look luminosity magnetic fields main sequence matter measure the distances method miles per hour miles per second moon more-distant most-distant nearby galaxy Newton's nova nucleus objects observable universe observatory Olbers parallax Peculiar motion photograph physics planets problem quasars quasi-stellar radar radial velocity radiation radio galaxies radio sources red shift rotate solar flare solar system space spectra spectrum spiral arms spiral galaxies star clusters structure supernova supersupernova tances tion velocity of light verse Virgo cluster wavelength young stars