Live coverage: Delta 2 launches

When SpaceX’s Falcon 9 rocket takes off with 64 small satellites — a payload cache representing 34 customers in 17 nations — it will be just the first act in a nearly five-hour sequence to deftly deploy each of the spacecraft, which range in size from a Rubik’s cube to a refrigerator.

The second set of Iridium’s next-generation satellites to launch on a SpaceX Falcon 9 rocket were prepared for liftoff inside a climate-controlled clean room at Vandenberg Air Force Base over the last few weeks.

An Ariane 5 rocket sent two Intelsat communications satellites into orbit Wednesday after liftoff from Europe’s space base in French Guiana at 2216 GMT (6:16 p.m. EDT; 7:16 p.m. local time).