redshift
/ˈrɛdʃɪft/
noun
- The increase in the wavelength of light from a distant galaxy or star, causing it to appear more red, often used as evidence that the universe is expanding.
- The redshift of the light from the quasar indicated it was billions of light-years away.
- Edwin Hubble's discovery of redshift helped prove that the universe is expanding.
- Astronomers measure the redshift of distant galaxies to determine how fast they are moving away from us.
Antonyms