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

Japan’s Hitomi X-ray observatory, beset by an attitude control problem that has disrupted communications since March 29, may have shed one of its power-generating solar panels or deployable telescope in orbit and is spinning too fast to contact ground controllers, officials said.

An upgraded Soyuz ferry ship, the second in a new series featuring improved avionics, navigation and other systems, glided to a flawless docking with the International Space Station early Friday, bringing three fresh crew members to the outpost and briefly boosting the lab’s crew back to six.

A European-built Ariane 5 rocket launched Tuesday with a U.S.-made communications satellite for Tokyo-based Sky Perfect JSAT and a South Korean environmental observatory. The heavy-lift Ariane 5 launcher took off from the Guiana Space Center in Kourou, French Guiana, at 5:18 p.m. EST (2218 GMT; 7:18 p.m. French Guiana time).