Light Years

By Elizabeth Landau, CNN

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…

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