Boaz Katz

Relativity and quantum mechanics diverge at the micro level. A new approach: if a quantum computer surpasses the classical speed limit of computation, it becomes a test of quantum gravity. A lab needs 500 logical qubits, the cosmos—1,600. Commercial roadmaps promise to reach that milestone soon.

Astronomers discovered that the Theta Eridani system contains three stars, with two inner ones locked in a tight dance. One star ran out of hydrogen fuel, swelled up, and wrapped its companion in a gaseous blanket. Friction inside this cloud triggered a bright flash that lasted for centuries. The fi