The history of our Universe is written in the skies. Examining ancient signals from the dawn of time, radio astronomers can reconstruct the evolution of the Universe.
What it took to collect these 54-million-year-old photons from a supermassive black hole
Two black holes, each about 30 times as massive as our sun orbited each other for millions of years. An instant before they collided they sent a gravitational shiver across the universe. LIGO scientist Amber L. Stuver explains. Animation by Eoin Duffy.