The universe has a 13.8 billion year long history behind it. Astronomers have already found lots of evidence to support the current model, but the more evidence there is for a theory, the better. To observe the formation of the universe, astronomers use actual time machines – their telescopes. The farther an object is away from us, the longer its light takes to reach us, and thus the farther back in time the light we are now seeing was created.
An international research group has now succeeded in observing the most distant galaxy group to date. “EGS77” is a trio of galaxies that existed at a time when the universe was only 680 million years old, which corresponds to 5 percent of the universe’s current age. Even more exciting for the astronomers, however, was the realization that EGS77 was still in the midst of an important process, namely the epoch of reionization. During this era, the universe first began to become transparent, like we know it today.