<p>➀ The European Space Agency's Proba-3 mission achieved millimeter-precision formation flying between two spacecraft, the Coronagraph and Occulter, maintaining a 150-meter separation autonomously for hours; </p><p>➁ The mission aims to study the Sun's corona by aligning the Occulter's 1.4m disc to cast a shadow onto the Coronagraph's instrument, enabled by laser metrology, optical sensors, and AI-driven algorithms; </p><p>➂ Key contributions came from ESA, MDA Space, Airbus Defence and Space, and Belgian institutions, with advanced technologies like the Fine Lateral and Longitudinal Sensor (FLLS) ensuring millimeter accuracy.</p>