As the first stars flickered on, their ultraviolet light excited neutral hydrogen atoms around them, causing the gas to emit a faint radio signal at 1,420 megahertz.

• 当第一批诞生的恒星开始闪烁，它们发出的紫外光会激发周围的中性氢原子，使这些气体发出频率为1420百万赫兹的微弱电波讯号。