A near-Earth asteroid is a small Solar System object whose orbit brings it close to Earth. The term matters in space operations because missions to these bodies often rely on long-duration radio links for navigation, health reporting, and scientific data. Those links can be observed from outside the spacecraft, so their timing, modulation, and frame structure may reveal useful technical details even when the payload is not yet fully decoded.
In cyber security, this is a reminder that proximity in space can create a communications surface in the same way proximity on a network can. A near-Earth asteroid mission may be a target for signal interception, traffic analysis, or spoofing attempts against poorly protected links. Defenders reduce that risk with encrypted telemetry, authentication, robust link budgets, and careful control of what is broadcast. The object itself is not the threat; the exposed communications around it are.