New simulations suggest that habitable worlds could have begun forming only 200 million years after the big bang.

By Conor Feehly edited by Lee Billings

Scientists today are quite sure about how long our universe has existed: it’s been 13.8 billion years, give or take 59 million years, since the cosmos burst into being via the big bang. But they’re much less certain about a related question: When could life have first arisen, somewhere out there? Our solar system formed a mere 4.6 billion years ago, after two thirds of cosmic time had already elapsed, and life seems to have happened here almost as soon as Earth cooled down from its fiery birth to harbor oceans of liquid water.