EditorialAn undated image from NASA TV shows the astronaut Don Pettit demonstrating his zero-gravity coffee cup on the International Space Station in 2008. (NASA TV via The New York Times)
EditorialGerald Carr, commander of the Skylab 4 mission in 1973-74, demonstrates zero gravity in the space station, which crashed back to Earth by the time the space shuttles began flying in 1981. (NASA via The New York Times)