China plots space-ground early-warning system for sunward asteroids

China's space agency announced plans to develop a coordinated space-ground asteroid early-warning network that would combine ground-based optical telescopes with a space-based observing constellation to detect near-Earth asteroids, especially those approaching from the sunward direction. The proposed architecture includes a basic model with a Sun-Earth L1 satellite plus northern and southern ground stations, and an extended model that adds Venus-like or distant retrograde orbits to improve sky coverage. The move aligns with China’s 15th Five-Year Plan, complements ongoing international efforts (e.g., NASA's DART, ESA's Hera), and emphasizes open data sharing and potential radar capabilities as gaps in current asteroid tracking persist. The development comes amid calls for stronger planetary defense and the upcoming International Year of Planetary Defense in 2029 and notable close approaches such as Apophis' flyby.