"Catastrophic failure," she said. "But not in the model. In reality."

"You're telling me the model is wrong?" Hollis said, not looking up from his tablet.

The first sign of trouble was a harmonic whisper only Dr. Aris Thorne could hear.

She was already building a new model. A bigger one. A ring around Mars this time.

Aris traced the boundary condition back. The coherent thermal oscillation wasn't natural. It was a 0.003 hertz signal—the exact frequency of the station-keeping thrusters on the orbital ring. They fired every 92 minutes, just enough to correct for tidal drag. The thermal wave propagated down the ribbon, hit the jet stream, reflected, and came back in phase .

Below 1.0 meant failure. The ribbon wouldn't snap immediately. It would begin to delaminate at the molecular level, shedding carbon fibrils like dandruff. Within six months, it would be a 40-kilometer-long rope of dust.