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

Four more satellites for SES Networks’ O3b broadband fleet launched Thursday aboard a Soyuz rocket. Liftoff of the Soyuz launcher from the Guiana Space Center in South America occurred at 1703 GMT (1:03 p.m. EDT).

Loaded with supplies to keep the International Space Station’s crew fed, clothed and busy with new science projects, a Cygnus cargo vessel sped into orbit today atop an Atlas 5 rocket.

SpaceX stood down from launch attempts on Thursday, Friday and Saturday. Poor weather forced the latest two scrubs, according to SpaceX.