Author: iamdefinitory

REDSHIFT PARAMETER (Z)
A dimensionless number quantifying how much light has been stretched due to redshift.

DOPPLER BROADENING
The spreading of spectral lines due to motion in a star or gas cloud.

RADIAL VELOCITY
The speed at which an object moves toward or away from an observer.

GRAVITATIONAL REDSHIFT
The redshift of light as it moves away from a strong gravitational field.

SPECTRAL LINES
Dark or bright lines in a spectrum used to measure redshift and blueshift.

HUBBLE CONSTANT (H₀)
The rate of expansion of the universe.

HUBBLE’S LAW
The observation that galaxies are moving away from us, with speed proportional to their distance.

RELATIVISTIC DOPPLER EFFECT
The change in wavelength due to the motion of an object at speeds close to the speed of light.

COSMOLOGICAL REDSHIFT
The redshift caused by the expansion of the universe, shifting light from distant galaxies.

BLUESHIFT
The shortening of light wavelengths when an object moves toward the observer.