Q&A with Keith Gendreau, principal investigator of the first X-ray space communications experiment (members only)

Hours after launching a batch of cargo and provisions to the International Space Station on Tuesday, SpaceX ground teams wheeled another Falcon 9 rocket into the hangar at Cape Canaveral for a commercial satellite launch set for April 27.

Keeping up a run of middle-of-the-night launches from Cape Canaveral, a SpaceX Falcon 9 rocket powered by a recycled first stage booster climbed into orbit early Tuesday with the Indonesian Merah Putih communications satellite.

Debuting lighter structural components to carry heavier satellites into orbit, a Russian Proton rocket fired into space from Kazakhstan on Thursday and successfully placed a U.S.-built television broadcast craft into orbit for Intelsat and DirecTV.