Noun
(astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
Source: WordNet3C 31 is an active galaxy and radio source in Perseus located at a distance of 237 million light-years from Earth (redshift 0.0173). Source: Internet
Alternative explanations Steady state The redshift hypothesised in the Big Bang model would by itself explain the darkness of the night sky even if the Universe were infinitely old. Source: Internet
Alternative hypotheses and explanations for redshift such as tired light are not generally considered plausible. Source: Internet
A more complete treatment of the Doppler redshift requires considering relativistic effects associated with motion of sources close to the speed of light. Source: Internet
A redshift occurs whenever a light source moves away from an observer. Source: Internet
After z is measured, the distinction between redshift and blueshift is simply a matter of whether z is positive or negative. Source: Internet