Astronauts will wriggle into their spacesuits next week to swab outside the International Space Station and see if the lab orbiting 250 miles above Earth is releasing microorganisms into space.
The experiment will focus on collecting samples of bacteria and fungi near vents. NASA wants to know whether germs can survive the harsh environment and, if so, how far they travel. The specimens will be frozen and taken back to Earth for analysis.
Despite the U.S. space agency’s stringent spacecraft cleaning process, hardy microscopic lifeforms can’t be totally removed from instruments bound for space. Furthermore, people carry veritable ecosystems of life on their skin and in their bodies when they go to space. Humans can’t help but spread this stuff — a point John Grunsfeld, NASA’s former chief scientist, emphasized in 2015.
Dispatches From The Front 