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XxBioFrenzyxX
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How are the distance and speed of a galaxy related?
They are related by so called Hubble law which really relates the distance and the observed redshift of a given galaxy which is assumed to be proportional to the "speed of recesion" of the galaxy v. The observed redshift is converted to the assumed "speed of recession" through the Doppler law, which for small Z's is v = Z c, where Z is observed redshift, and c the speed of light and then the distance is calculated from d = v / H, where H is Hubble constant (presently about 70 km/s/Mpc, Mpc being about 3,000,000 light years).XxBioFrenzyxX said:How are the distance and speed of a galaxy related?
Hubble's Law is a fundamental relationship in astronomy that states that the farther away a galaxy is from us, the faster it is moving away from us.
Hubble's Law is named after American astronomer Edwin Hubble, who discovered the relationship between the distance and velocity of galaxies in the 1920s.
Hubble's Law is used to estimate the distance and velocity of galaxies. It also provides evidence for the expansion of the universe and the Big Bang theory.
The equation for Hubble's Law is v = H0 x d, where v is the velocity of a galaxy, H0 is the Hubble constant (a measure of the rate of expansion of the universe), and d is the distance of the galaxy from us.
Yes, Hubble's Law is still considered valid today. However, the value of the Hubble constant has been refined over the years as more accurate measurements of galaxy distances and velocities have been made.