Quasar 'clocks' show the universe was five times slower soon after the Big Bang

Astronomers observe time dilation in early universe

Time appears to run five times slower in the early universe

Gravitational lensing has been used for the first time to detect and measure an inactive black hole. The door is now open to study the largest black holes in the universe. "Gravitational lensing events are rare, but are most prevalent in the most massive galaxies, that host the largest black holes."