One of SpaceX’s Falcon 9 rocket boosters made its second trip into space Friday, lofting a Bulgarian television broadcasting satellite from launch pad 39A at NASA’s Kennedy Space Center in Florida, then landing on a platform in the Atlantic Ocean. Liftoff occurred at 3:10 p.m. EDT (1910 GMT).

The problem for NASA and Boeing is that the Starliner’s service module, which houses the helium lines, thrusters and other critical systems, is discarded before re-entry and burns up in the atmosphere. Engineers will not be able to study the hardware after the fact and as a result, they want to collect as much data as possible before NASA astronauts Butch Wilmore and Sunita Williams head home.

A Soyuz rocket carrying a military spy satellite for the United Arab Emirates lifted off from French Guiana at 8:33 p.m. EST Tuesday (0133 GMT Wednesday). A launch attempt Sunday night was scrubbed due to the risk of lightning, and a countdown Monday was called off due to a telemetry issue associated with the range safety system at the Guiana Space Center.