Four more satellites for SES Networks’ O3b broadband fleet launched Thursday aboard a Soyuz rocket. Liftoff of the Soyuz launcher from the Guiana Space Center in South America occurred at 1703 GMT (1:03 p.m. EDT).

SpaceX is preparing for the next launch of a Falcon 9 rocket, set for blastoff from the Kennedy Space Center in Florida with the EchoStar 23 television broadcast satellite destined to cover Brazil. The rocket’s static fire test, a major milestone in any SpaceX launch campaign, was performed Thursday.

A United Launch Alliance Delta 4 rocket went through a practice countdown and fueling exercise this week to prepare for its Aug. 19 liftoff to deliver a pair of orbital surveillance satellites into space.