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

Two veteran cosmonauts ventured outside the International Space Station Wednesday, swapped out materials science space exposure samples, installed handrails needed for future spacewalks and tested an applicator and thin-film coatings that could prove useful reconditioning aged or damaged hull panels.

Check out a dazzling drone’s-eye view of SpaceX’s Falcon 9 rocket booster returning to an on-target landing at Cape Canaveral a few minutes after launching Sunday with more than 2.5 tons of space station cargo.

NASA announced agreements worth a combined $43.2 million with 14 commercial partners Friday — including Blue Origin and SpaceX — to fund experiments in propellant and power generation, in-space refueling, efficient propulsion systems, and lunar rover technology.