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

A Soyuz spacecraft carrying a three-man crew parachuted to the flat grasslands of Kazakhstan on Saturday, returning home from the International Space Station with cosmonaut Yuri Malenchenko, NASA astronaut Tim Kopra and British flight engineer Tim Peake.

The Falcon Heavy rocket was lowered to the horizontal position before sunrise Friday morning after less than a day standing at the launch pad.

Gusty winds associated with a subtropical low pressure system prevented United Launch Alliance from sending an Atlas 5 rocket into orbit Saturday from Cape Canaveral with the U.S. Air Force’s clandestine X-37B spaceplane. ULA plans to try again Sunday, and a SpaceX Falcon 9 rocket launch from a nearby pad has been delayed to Tuesday.