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- W1637415308 abstract "Extragalactic astronomy is a relatively young field. It was only in the 1920’s that we became aware that galaxies outside our own exist, largely through the efforts of Edwin Hubble, who had been observing peculiar nebulae with the newly completed 100-in. telescope at Mt. Wilson. Shortly after the existence of galaxies was established Hubble discovered the law of recession. That is, distant galaxies are moving away from us at a velocity proportional to their distance: v = Hd, where v is the recession velocity, d is the distance, and H is the proportionality factor, Hubble’s constant, presently believed to be 50 km s -1 Mpc-1. The recession velocity is found by observing a galaxy’s redshifted absorption lines in the integrated starlight from the galaxy. The distance is found by using ‘standard candle’ objects in distant galaxies whose absolute luminosity is known; the apparent luminosity then gives the distance." @default.
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- W1637415308 date "1974-01-01" @default.
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- W1637415308 title "Extragalactic X-Ray Sources" @default.
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- W1637415308 doi "https://doi.org/10.1007/978-94-010-2105-0_9" @default.
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