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Space & Astronomy
Redshift
Redshift is the phenomenon where electromagnetic radiation’s wavelength is stretched, shifting its color toward the red end of the spectrum, indicating motion away from the observer or the influence of gravity and cosmic expansion.
Space & AstronomyHubble Constant
The Hubble constant quantifies the current rate of cosmic expansion, linking a galaxy’s recessional velocity to its distance from Earth.
Space & AstronomyBlueshift
Blueshift is the shortening of electromagnetic wavelengths—an increase in frequency and energy—observed when a light source moves toward an observer or when space itself contracts.
ScienceDoppler Effect
The Doppler effect is the change in frequency or wavelength of a wave due to relative motion between the source and observer, first described by physicist Christian Doppler in 1842.