May 30, 2016

Homework Help: Science need help ?????///

Posted by sam on Sunday, April 14, 2013 at 4:59pm.

An astronomer observes two galaxies, A and B, which have redshifts of:

Galaxy A = 0.020 and Galaxy B = 0.010.

Which galaxy is closest to us and what is its distance away from us?

You may assume that the Hubble constant is H0 = 75 km s1 Mpc−1 and that the speed of light is
c = 3.0 105 km s1.

The closest galaxy is: Galaxy a?? or galaxy b??
It is at a distance of ????? Mpc.?

Assuming that Galaxy A is intrinsically of identical luminosity to Galaxy B, how does its apparent brightness on the night sky compare to that of Galaxy B?

Galaxy A is ???? times BRIGHTER or FAINTER??? than Galaxy B.

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