Astronomy
The Cosmic Dawn: First Light and the Epoch of Reionization
Quick fact
Astronomers have detected the faint radio signal from hydrogen gas during the Cosmic Dawn, revealing that the first stars began ionizing the universe about 180 million years after the Big Bang.
Why this is interesting
Have you ever wondered what the universe looked like before there were any stars? The first few hundred million years were a dark, featureless void—until something extraordinary happened.