Live coverage: Two satellites lift off aboard Ariane 5

Days before breaking ground on a new spacecraft assembly line near Cape Canaveral, OneWeb and Intelsat announced a proposed merger Tuesday that would couple a planned fleet of 900 broadband Internet satellites with a high-power communications network in geostationary orbit.

A Vega rocket faltered minutes after liftoff from French Guiana at 9:53 p.m. EDT Wednesday (0153 GMT) and failed to reach orbit with a European-built reconnaissance satellite for the United Arab Emirates. The payload and launcher fell into the Atlantic Ocean, marking the first failure for the solid-fueled Vega launch vehicle.

An Ariane 5 rocket launched Tuesday with the Arabsat 6B and GSAT 15 communications satellites to broadcast television across the Middle East, North Africa and Central Asia and link India with telecom and navigation services. Liftoff from Kourou, French Guiana, occurred at 2134 GMT (4:34 p.m. EST).