Q&A with Guglielmo Aglietti, RemoveDebris principal investigator (members only)

Unimpeded by rain showers and a dark gray blanket of low clouds, an Ariane 5 rocket thundered away from a European-run space base in the jungle of French Guiana Tuesday to place four Galileo navigation satellites in orbit, an on-target deployment that should improve the location accuracy of new smartphones around the world.

The first launch of an Italian-made Vega rocket since an in-flight failure nearly one year ago has been postponed to no earlier than Monday night due to unfavorable upper level winds over the Vega launch base in Kourou, French Guiana.

An Ariane 5 rocket lifted off Thursday at 2345 GMT (7:45 p.m. EDT), flying from a French Guiana launch pad to geostationary transfer orbit with the ViaSat 2 and Eutelsat 172B communications satellites.