Question

The rate at which two galaxies are moving away from each other can be determined from Hubbles law. This speed can be estimated by multiplying the distance between the galaxies by the Hubble constant of 20 kmsMlly. The formula is v = Hod where H0 is the Hubble constant and d is the distance between the galaxies. A galaxy is 10 Mly away from the Milky Way. How fast is this galaxy moving away from the Milky Way in kilometers per second? km

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Answer #1

given

Ho = 20 Km/s/Mly

and

d = 10 Mly

using equation to find velocity is " v "

v = Ho d

= ( 20 Km/s / Mly ) x ( 10 Mly )

= ( 20 Km/s x 10 )

the Galaxy moving away from the Milky way is with v = 200 Km/s

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