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

A Russian Soyuz rocket rolled out to a launch pad Monday at the Baikonur Cosmodrome in Kazakhstan, ready for final inspections, checkouts and fueling before liftoff Thursday with a Progress supply ship bound for the International Space Station.

The first launch of Boeing’s Starliner space capsule aboard a United Launch Alliance Atlas 5 rocket has been delayed to Dec. 19, officials announced Tuesday.

The mission will the fifth flight to space for Peggy Whitson, the American with the most spaceflight experience in history. Liftoff on Wednesday, June 25 is set for 2:31 a.m. EDT (0631 UTC) from Launch Complex 39A.