All NASA centers and facilities will begin a mandatory telework policy for agency and contractor employees effective immediately, except for “mission-essential” personnel, to combat the threat from the coronavirus pandemic, officials announced Tuesday.

A Russian Soyuz spacecraft carrying three space station crew members hurtled back to Earth Thursday, completing a fiery plunge back through the atmosphere before settling to a frigid touchdown on the snowy steppe of Kazakhstan to close out a 139-day mission.

After prepping their patient — a $2 billion cosmic ray detector — during two earlier spacewalks, two space station astronauts ventured back outside for a third outing Monday to carry out what amounted to transplant surgery, installing replacement coolant pumps in a bid to revive the costly instrument and extend its life.