Live coverage: Soyuz crew lands in Kazakhstan

Assuming a May 1 launch, the Starliner spacecraft would dock with the ISS on May 2. The spacecraft will launch on the 100th flight of United Launch Alliance’s Atlas 5 rocket.

European engineers are eager to test an experimental re-entry demonstrator Wednesday to validate technologies for future robotic exploration probes, winged space planes, and reusable rocket boosters.

Russia is delaying the return to Earth of three space station crew members by about a month in the wake of the failure of a Russian Progress supply ship that spun out of control moments after reaching orbit April 28. Launch of three fresh crew members also will be delayed, from May 26 to late July.