“The coating is designed to be radiation‑hard,” Lukas replied, “but we might have underestimated . Each passage through the SAA injects a dose of high‑energy electrons that can create color centers—tiny defects in the dielectric that absorb specific wavelengths.”
Lukas nodded. “The flare raised the temperature of the satellite’s outer skin by about 15 °C for roughly ten minutes. That thermal gradient is enough to cause differential expansion between the mirror substrate and the coating. If there was a microscopic flaw—a grain boundary or an inclusion—right there, it could have acted as a seed for the crack.”
Amina stared at the screen. “If the flare was the trigger, does that mean any future solar event could exacerbate it? Or—”
Within minutes, the first images streamed down. The ultraviolet‑filtered view of the Earth was a quilt of pale blues and whites, punctuated by the familiar darkening over the Antarctic. The OI‑2 AI flagged the first data point: a 3‑percent depletion over the South Pole, consistent with historical trends.
Across the ocean, in the control room at the European Space Operations Centre (ESOC) near Munich, Dr. Lukas Weber, the senior optical engineer for the OI‑2 program, squinted at his own monitor. “Delamination? That’s impossible. We performed a 10‑year life‑test on the coating. It should have survived another three decades.”
