Huge New Discovery About The Universe

3-Second Blueprint (English)

1. Ground-based gravitational-wave detectors since 2015 only capture high-frequency ripples because their arms have finite length.
2. Over 15 years, astronomers used large radio telescopes to time steady radio pulses from spinning stars called pulsars.
3. Tiny timing shifts in those pulsar signals revealed a continuous cosmic background of long, low-frequency gravitational waves.