Works / a_distant_place


The Universe is expanding. This means that from Earth, astronomers see that the most distant galaxies seem to be moving away much faster than those that are close by. As the distant galaxy travels away from us, the wavelength of light that it emits stretches and is “redshifted” toward the infrared part of the electromagnetic spectrum. This means that a very distant galaxy emitting primarily visible or ultraviolet light will appear infrared by the time its light reaches Earth.