Europe's Proba-3 satellites ace landmark formation-flying test

A pair of spacecraft have demonstrated ultra-precise formation flying in orbit for the first time, marking a milestone with major implications for both science and future space missions. The European Space Agency's (ESA) Proba-3 mission, consisting of two spacecraft called the Occulter and the Coronagraph, flew in perfect formation at a distance of 150 meters (492 feet) from each other with millimeter precision, the agency announced in a May 8 statement. More

(Source: Space.com - May 13)