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

Two U.S. astronauts and a Russian cosmonaut, all spaceflight veterans, launched from Kazakhstan aboard a Soyuz booster Wednesday to begin a two-day pursuit of the International Space Station. The crew docked with the orbiting research complex Friday at 1940 GMT (3:40 p.m. EDT) to begin a five-month stay.

The Japanese space agency has delayed the planned Sept. 30 launch of an HTV space station cargo ship to repair a leak in the vehicle, clearing the way for Orbital ATK to slip the launch of its Cygnus supply ship from Aug. 22 to the second half of September to complete tests and analysis of its re-engined Antares rocket, officials said Wednesday.

An automated mini-helicopter driven by two fast-spinning, counter-rotating rotors took off from the surface of Mars, hovered for 30 seconds, then successfully landed Monday to complete the historic first powered flight of an aircraft on another planet.