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The Expedition 61 astronauts are ready to finish repairing the Alpha Magnetic Spectrometer (AMS) after wrapping up their spacewalk preparations today. The International Space Station residents today also had time to explore what microgravity is doing to their muscles and digestive system.

Astronauts Andrew Morgan and Luca Parmitano have readied the U.S. spacesuits they will wear for about six hours and 30 minutes beginning Saturday at 6:50 a.m. EST. They will finalize the complex thermal repairs on the AMS, a dark matter and antimatter detector, installed in 2011 on the Starboard-3 truss structure. NASA TV will start its live spacewalk coverage at 5:30 a.m.

The spacewalking duo were joined by NASA Flight Engineers Jessica Meir and Christina Koch for a final procedures review with mission controllers on the ground. Meir and Koch will operate the Canadarm2 robotic arm carefully making fine-tuned maneuvers to assist the spacewalkers at the AMS worksite.

Meir and Koch actually started Friday scanning their neck, arm, leg and feet muscles with an ultrasound device. The scans are downlinked to doctors studying how weightlessness affects the biochemical properties of muscles. The pair also collected their blood samples and stowed them in a science freezer for the human research study. Insights my impact health strategies on future long-term space missions.

Cosmonauts Alexander Skvortsov and Oleg Skripochka spent Friday morning on a Russian digestion study today scanning their stomachs with another ultrasound device before and after breakfast. They split up in the afternoon working on a variety of station hardware maintenance and crew departure activities.

The International Space Station is orbiting higher today as three Expedition 61 crewmates get ready to return to Earth in two weeks. Meanwhile, two astronauts are finalizing preparations for a spacewalk early Saturday.

Russia’s Progress 74 cargo craft fired its engines twice boosting the space station’s altitude Thursday morning. The orbital adjustment sets up the correct trajectory for the undocking and landing of the Soyuz MS-13 crew ship on Feb. 6.

The Soyuz MS-13 will be commanded by Alexander Skvortsov returning home with astronauts Christina Koch and Luca Parmitano. The trio will parachute to a landing in Kazakhstan at 4:14 a.m. EST (3:14 p.m. Kazakh time). Koch will have lived in space continuously for 328 days, second only to U.S. astronaut Scott Kelly with 340 days.

The third spacewalk of January 2020 is set to begin Saturday at 6:50 a.m. EST with live NASA TV coverage getting under way at 5:30 a.m. Parmitano with NASA Flight Engineer Andrew Morgan will complete the complex thermal repairs on the Alpha Magnetic Spectrometer, a dark matter and antimatter detector.

Koch and fellow NASA astronaut Jessica Meir will assist the spacewalkers with the Canadarm2 robotic arm and are getting up to speed with the fine-tuned robotics maneuvers. They were joined by Morgan and Parmitano as the quartet reviewed spacewalk tasks and procedures.