1. A likely false alarm aboard the International Space Station forced its crew to shut themselves in the Russian segment as a precaution, and former station commander Chris Hadfield took to Twitter to explain how astronauts train for such emergencies.
  2. Early indications were that ammonia, used on the ISS as a coolant, was leaking into the station.
  3. Hadfield explained that a coolant leak is one of the "big three" emergencies that astronauts train for, the other two being fire or smoke on the station and medical emergencies.
  4. NASA posted updates on the situation on Twitter, saying that a coolant leak hadn't been confirmed.
  5. Hadfield then explained what the solution would be if there were an actual coolant leak on the ISS.
  6. Responding to emergencies is part of the extensive training that every astronaut goes through, Hadfield explained.
  7. NASA later said at the ISS Mission Control Center said the detected change in pressure in the cooling system was likely the result of an error.
  8. Just to be safe, though, the ISS crew of six will for now be living (and not working) in a space just one-quarter the size they're used to.
Read next page