What is Cosmological Redshift?
Release Date: March 21, 2019 10:00AM (EDT)
Release ID: 2019-20
Media Use: Copyright
About This Image
The universe is expanding, and that expansion stretches light traveling through space in a phenomenon known as cosmological redshift. The greater the redshift, the greater the distance the light has traveled. As a result, telescopes with infrared detectors are needed to see light from the first, most distant galaxies.