Hubble Has Found the Ancient Galaxies That Gave the Universe Its First Light
A new technique that removes the light of foreground galaxy clusters is giving astronomers a direct look at a generation of galaxies dating back to the universe's baby years. The discovery is considered a key piece of evidence for a critical, but poorly understood period of time when the universe switched from being dark to radiating light. Scientists theorize that energy from first-generation galaxies transformed the dark, electrically neutral universe into ionized and radiating plasma. But these faint galaxies are not easy to find.