Concept
Doppler Effect
Frequency shift due to relative motion.
The change in observed wavelength or frequency caused by relative motion between source and observer — the foundation of radial velocity measurements.
Overview
The change in observed wavelength or frequency caused by relative motion between source and observer — the foundation of radial velocity measurements.
See also
Parallax
Apparent shift of a nearby object against a distant background.
Blueshift
Light shifted to shorter wavelengths.
The Big Bang
How everything began, 13.8 billion years ago.
Black Holes
Regions where gravity stops light itself.
Dark Matter
The invisible mass holding galaxies together.
Dark Energy
The mysterious force accelerating the universe.