Carrying a rifle and keeping an alcohol-ration card are a few things that surprised me about living in Longyearbyen, the northernmost town on Earth.

The rest of the 400 landings have come courtesy of SpaceX's powerful Falcon Heavy, whose first stage consists of three modified Falcon 9 boosters. (The Heavy can notch three landings on a single ...

Space missions lasting months can result in muscle atrophy, bone density loss, and fluid redistribution, all of which are amplified by microgravity.