Breaking Distant Light

In the distant universe, time appears to run slow. Since time-dilated light appears
shifted toward the red end of the spectrum (redshifted), astronomers are able to use
cosmological time-slowing to help measure vast distances in the universe. Above, the
light from distant galaxies has been broken up into its constituent colors (spectra),
allowing astronomers to measure the redshift of known spectral lines. The novelty of
the above image is that the distance to hundreds of galaxies can now be measured on
a single frame using the Visible MultiObject Spectrograph operating at the Very Large
Telescope array in Chile. Analyzing the space distribution of distant objects will allow
insight into when and how stars, galaxies, and quasars formed, clustered, and evolved
in the early universe.