Watch a replay of the Soyuz launch and abort

A Russian Proton rocket is scheduled to take off from Kazakhstan on Sunday with the second spacecraft to serve Inmarsat’s $1.6 billion next-generation satellite communications network geared for getting faster links to customers on the move.

Russian and European teams at the Guiana Space Center in South America plan to detach a UAE spy satellite from its Soyuz launcher to replace the rocket’s Fregat upper stage, forcing a likely delay until April from the mission’s original launch date of Friday.

Picking up where they left off last week, two space station astronauts ventured back outside the outpost Wednesday to continue the replacement of aging batteries in the lab’s solar power system. Two more spacewalks later this month should complete the multi-year project.