Final answer:
Hubble's Law suggests that the universe is expanding, as evidenced by the redshift observed in the light spectra of distant galaxies. The law states that a galaxy's recession velocity is proportional to its distance from Earth, which helps to determine the distances to remote galaxies.
Step-by-step explanation:
Hubble's Law: Understanding the Expanding Universe,
Hubble's Law, formulated by Edwin Hubble in 1929, implies a fundamental aspect of our universe: it is expanding. This law states that the velocity of a galaxy moving away from us (recession velocity) is directly proportional to its distance from Earth. This relationship is depicted by the equation v = H₀d, where v is the recession velocity, H₀ is Hubble's constant, and d is the distance to the galaxy. One of the critical pieces of evidence for this law is redshift, which is observed when the spectral lines of light from a galaxy are displaced toward longer wavelengths, indicating that the galaxy is moving away from us.
The implication of Hubble's Law is profound as it underpins the theory of the Big Bang and all our consequent understanding of the universe's origin and evolution. Moreover, Hubble's Law provides a method to calculate the distances to remote galaxies by measuring the redshift in their spectral lines, which directly relates to their velocity of recession due to the expansion of the universe.