What is Hubble’s Law? How is this law used to calculate distances to galaxies?
Objects in the universe appear to be moving apart from each other. Further a galaxy from the observer, the faster it moves. In other words the rate at which a galaxy move away is directly proportional to the distance from the observer. Hubble’s Law, is used to derive the distance of a far away objects (galaxies) by measuring the object’s recessional velocity and dividing it by Hubble’s constant. H = v/d
Where, v= radial outward velocity,
D= the galaxy's distance from earth, and
H= current value of the Hubble constant.
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