Redshifting on the universe. #redshift#wavelength#infrared

As the universe expands, it stretches the
wavelengths of light along with it, a process called
redshift. The farther away an object is, the more the light from it has stretched by the time it reaches us. Stretching over distance makes redshift one of the key tools for measuring the universe. Since astronomers can usually determine what wavelength they would see from up close, they can tell how far a galaxy is by how much the light has changed. Distant galaxies have all of their visible light shifted into infrared.
#nasa#spacex#esa#infrared#universe#wavelength#redshift#galaxies.