Using lensed gravitational waves to measure cosmic expansion

Santa Barbara CA (SPX) Jul 01, 2023
The universe is expanding; we've had evidence of that for about a century. But just how quickly celestial objects are receding from each other is still up for debate. It's no small feat to measure the rate at which objects move away from each other across vast distances. Since the discovery of cosmic expansion, its rate has been measured and re-measured with increasing precision, with some