Researchers may have detected signals from the universe’s first stars
The early development of our universe is still quite a mystery, but in a new study published today in Nature , researchers describe what may be evidence of when the first stars began to form. After the Big Bang, which took place some 13.7 billion years ago, the universe was dark, hot and full of high-energy particles. Photons couldn't survive, but after around 380,000 years, the universe cooled enough to allow light to actually stick around. That's when the cosmic microwave background (CMB) came to be. It's our universe's first surviving radiation and researchers have looked to it in order to learn more about the earliest years of our universe. Researchers have theorized that we might be able to see when stars began to form by looking for a dip in the intensity of the CMB. The reasoning is that once stars started forming, they would have heated up the hydrogen gas permeating the universe. When that gas heated up, it would have absorbed radiation from the CMB, cau...