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Hubble’s Law of Expansion
Space, Astronomy and Cosmology

Hubble's Law: The Equation Behind Cosmic Expansion

Hubble's law is the observation that distant galaxies move away from Earth at speeds proportional to their distance.

Doppler Effect in Astronomy
Space, Astronomy and Cosmology

Doppler Effect: How Astronomers Measure Cosmic Motion

The Doppler effect in astronomy is the shift in wavelength or frequency of light from a celestial object caused by its motion relative...