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

These photos show Monday’s rollout of an Ariane 5 rocket on a 1.7-mile journey to its launch pad at the Guiana Space Center in South America.

The launch of a NASA ionospheric research satellite off Florida’s east coast is targeted for Oct. 9 after persistent technical problems with its air-dropped Pegasus rocket stymied two launch opportunities last year.

A Cargo Dragon spacecraft launched to begin its fifth journey to the International Space Station, carrying with it more than 6,000 pounds of science and supplies. Liftoff happened at 9:29 p.m. EST Monday (0229 UTC Tuesday).