🌌 What is a pulsar?

Imagine the crushed core of a dead star, only about 20 kilometers across, spinning hundreds of times per second—and sending beams of radiation sweeping through space like a cosmic lighthouse. 🔭 That's a pulsar. As it rotates, its radiation beam periodically sweeps across Earth. Every time it does, our telescopes detect a pulse. Some pulsars are so incredibly regular that astronomers use their signals as cosmic clocks to study gravity, space, and even planets orbiting other stars. 🤯 A dead star… A cosmic lighthouse… And one of the universe's most precise natural clocks. ⏱️🌌 💬 Did you know what a pulsar was before watching this? Follow Epic Imagination for more mind-blowing discoveries from the universe.