blueshifts
/ˈbluːʃɪfts/
noun
- The plural form of blueshift; a phenomenon in which light or other electromagnetic radiation from an object moving toward an observer is shifted to shorter wavelengths (toward the blue end of the spectrum).
- Blueshifts are less common than redshifts in astronomical observations.
- Astronomers measure blueshifts to determine how fast stars are moving toward Earth.
- The blueshifts observed in distant galaxies help scientists understand the universe's motion.