tag #black-holes 1 reading card on “black-holes”, in chronological order. Part of the full archive. 2026-05-15 Binary Pulsars Clocks in motion, watched by clocks — and sometimes, mid-experiment, the clock turns away. A pulsar locked in orbit with another compact body becomes a moving timepiece whose ticks can be tracked to nanoseconds. That precision is what makes binary pulsars the most demanding laboratory we have for gravity — and what occasionally reveals that one of them has stopped pointing at us.
