Nasa's Sentry system, for one. https://cneos.jpl.nasa.gov/sentry/ https://cneos.jpl.nasa.gov/sentry/ Nasa's also planning to launch the Near-Earth Object Surv

Nasa's Sentry system, for one. https://cneos.jpl.nasa.gov/sentry/ https://cneos.jpl.nasa.gov/sentry/ Nasa's also planning to launch the Near-Earth Object Surveillance Mission, an orbital telescope designed to detect NEO's with more accuracy than ground-based systems. https://www.express.co.uk/news/science/1250770/asteroid-detection-news-how-astronomers-track-asteroid-space-nasa-news https://www.express.co.uk/news/science/1250770/asteroid-dete... And ESA (Europe space agency) is building a spacecraft designed to nudge NEO's out of their path. https://arynews.tv/en/esa-asteroid-defence-mission/ https://arynews.tv/en/esa-asteroid-defence-mission/