The universe was just a kid at 4 billion years old. Thursday,
scientists said that they have a measurement for all of the
light that was around at that time that's still traveling to us.
It's called the extragalactic background light. This includes
light from stars that existed when the universe was even younger
than 4 billion years old. Researchers report in the journal
Science that this can help with understanding how stars formed
and how galaxies evolved. "I think it's amazing to be able to
probe our universe when it was so young, when the very first
stars formed," said Marco Ajello, researcher at Stanford
University and study co-author. Researchers write in the study
that there have been several attempts in the past to detect this
phenomenon, but none were successful. The finding is important
for estimating the number of smaller, fainter galaxies that
current telescopes cannot detect, said Claude-Andre Faucher-
Giguere, researcher in the Department of Astronomy at the
University of California, Berkeley, wh