2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86156Mediums which do not support the propagation of plane waves with negative phase velocity (NPV) when viewed at rest can support NPV propagation when they are viewed in a reference frame which is uniformly translated at sufficiently high velocity. Thus, relativistic negative refraction may be exploited in astronomical scenarios.OpticsSpace Physicstext