Vega's fuel-free CubeSats to keep formation with wings

Spain’s trio of ANSER CubeSats, due to fly on Europe’s next Vega launcher, will fly like a flock of birds in orbit – in more ways than one. Keeping in formation by following their leader, the three shoebox-sized satellite will image Iberian waters as if they are a single standard-sized mission. And they will unfurl wing-like flaps to maintain their relative positions, surfing on the scanty airflow at the top of Earth’s atmosphere.