Gravitational Waves Keep Rolling Past Earth

The stars orbited each other like a pair of dancers, their sequined costumes glowing against a dark stage. Round and round they went, until the distance between them began to shrink. The closer they got, the faster they spun. And then, smack! The stars collided.

About 500 million years later, Mansi Kasliwal’s phone rang in the middle of the night in April. “Dear human,” a robotic voice said when she picked up. “You have received a new gravitational-wave alert.”

The signal from the cosmic dance had reached her at last.

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