Ultra Deep Field Galaxies and Hubble Filters

These four candidate galaxies might have emitted their light when the universe was just 750 million years old. The bottom row shows the the various wavelengths that each galaxy was measured in, and the right-hand column displays the galaxy’s redshift, or how the expansion of the universe stretched light as it traveled long distances to reach us. The candidates were found using the Hubble Ultra Deep Field and the Great Observatory Origins Deep Survey observations.