# determine the velocity

label Physics
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a distant galaxy is determined to be 150 million light years distant and moving away from us, using the hubble law determine its velocity

May 3rd, 2015

Hubble's Law. It states that the recessional velocity of a galaxy is proportional to its distance from us:

ν = Hod [Eqn. (1)]

where v is the galaxy's velocity (in km/sec), d is the distance to the galaxy (in megaparsecs; 1 Mpc = 1 million parsecs), and Ho is the proportionality constant, called "the Hubble Constant." Hubble's Law states that a galaxy moving away from us twice as fast as another galaxy is twice as far away as that galaxy (or, three times faster is three times farther away than another galaxy, etc.). The Hubble constant is a hotly contested quantity in astrophysics. In order to precisely determine the value of Ho, we must determine the distances to and velocities of many galaxies, preferably those extremely far away so that we get beyond the Milky Way's gravitational interaction with "nearby" galaxies.

May 3rd, 2015

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May 3rd, 2015
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May 3rd, 2015
Nov 24th, 2017
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