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March 26, 2017

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A galaxy is receding away from us with a recession velocity of 100,000 km/s. What is the distance to this galaxy? What is the redshift z of this galaxy?

  • Astronomy - ,

    imagine you have obtained spectra from several galaxies and have measured the Red shift of each galaxy to determine the speed away from us. Here are your results:
    Galaxy 1: speed away from us is 10,000 Km/sec.
    Galaxy 2: speed away from us in 1,500 Km/sec.
    Galaxy 3: speed away from us is 30,000 Km/sec.
    extimate the distance to each galaxy from hubble's law. assume that H=23Km/s/Mly

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