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

A Russian Proton rocket launched at 0345 GMT Thursday (11:45 p.m. EDT Wednesday) from the Baikonur Cosmodrome in Kazakhstan with the EchoStar 21 communications satellite, a hefty 7.6-ton telecommunications station designed to support a mobile network in Europe. Managed by U.S.-based International Launch Services, the mission will take more than nine hours to deliver EchoStar 21 into a geostationary transfer orbit using five burns of the Breeze M upper stage engine.

SpaceX has delayed a planned Falcon 9 launch with a Japanese communications satellite to Friday due to inclement weather on Florida’s Space Coast.

SpaceX hopes to take a giant leap forward in rocket technology a few minutes after Friday’s scheduled launch of a Falcon 9 booster taking up 2.5 tons of critical supplies and experiments to the International Space Station.