Inquiry into Physics

8th Edition
ISBN: 9781337515863
Textbook Problem

. If a galaxy is found to have a recessional speed of 140,000 km/s, about how far away is it? The current estimate of the precision of the Hubble parameter is approximately ±5%. Determine the range within which the true distance to the galax lies.

To determine

The range in which galaxy lies.


Given info:

  Recessional speed (v)=140000 km/sHo=20.8 kmsmly

Formula used:



Substituting the given values, we get

  140000=20.8×dd=6730.76 mly

For range ±5%

Upper limit Ho=20

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