NASA astronaut Peggy Whitson floats in front of the Cupola window at the International Space Station. The cupola is the largest window ever launched into space and provides a clear view of Earth and incoming cargo shipments.
NASA's Apollo 15 mission launched July 26, 1971, and marked the debut of the "moon buggy" as well as the three moonwalks and the longest stay yet on the moon's surface. Here's a look at the preparation and execution of the epic mission.
In July 2017, six explorers embarked upon a lengthy simulated Mars mission in the Canadian arctic, kicking off the second part of the two-phase Mars 160 expedition. See photos of both phases (the first of which took place in the Utah desert) here.