noun
blueshift
Physics term for the shortening of observed wavelengths when a light source moves toward the observer. Often contrasted with 赤方偏移 (redshift).
See also: 赤方偏移
遠くの銀河の中には、青方偏移を示すものもある。
Some distant galaxies show a blueshift.
Blueshift means that the light source is approaching the observer.