Hubble's Law: Can somone be nice and answer this.

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    Hubble's law Law
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SUMMARY

Hubble's Law establishes a direct relationship between the distance of a galaxy and its observed redshift, which correlates to its speed of recession. The formula v = Zc, where v is the speed, Z is the observed redshift, and c is the speed of light, is used to calculate this speed. Subsequently, the distance can be determined using the equation d = v / H, where H represents the Hubble constant, currently estimated at 70 km/s/Mpc. This law is fundamental in understanding the expansion of the universe.

PREREQUISITES
  • Understanding of Hubble's Law
  • Familiarity with redshift and its implications in astronomy
  • Basic knowledge of the Doppler effect
  • Awareness of the Hubble constant and its significance
NEXT STEPS
  • Research the implications of Hubble's Law on cosmology
  • Learn about the Doppler effect in detail
  • Explore the calculation of distances in cosmology using redshift
  • Investigate the historical development of the Hubble constant
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Astronomers, astrophysics students, and anyone interested in the dynamics of the universe and the principles of cosmic expansion.

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How are the distance and speed of a galaxy related?
 
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XxBioFrenzyxX said:
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).
 
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