Sentry (NASA)

NASA's Sentry is a proactive system that continuously monitors the orbits of near-Earth objects (NEOs), like asteroids and comets, to identify potential collision threats with our planet. It uses advanced telescopes and computational models to track these objects, predict their future paths, and assess impact risks decades in advance. Sentry helps NASA and other agencies prioritize observation efforts, plan potential deflection strategies if necessary, and keep the public informed. Its goal is to enhance planetary defense by ensuring we are prepared for any possible asteroid impact, reducing the risk to Earth.