High above the Earth, the ambition to connect the world through laser light runs into a fundamental constraint: a beam so narrow that the slightest drift means silence. Physik Instrumente, a German precision motion company, has spent years engineering the answer — fast steering mirrors capable of correcting a laser's aim billions of times more finely than a single degree, fast enough to keep two satellites in conversation as they hurtle through orbit. It is a quiet, unglamorous technology, but one on which the next generation of high-speed, low-latency space communication now depends.