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Ultra-cold science and nanosatellites kept the Expedition 61 crew busy on Tuesday while the International Space Station is getting ready for the departure of a cargo craft and crew ship.

The Cold Atom Lab (CAL) enables research into the quantum effects of gases chilled to nearly absolute zero, which is colder than the average temperature of the universe. NASA Flight Engineers Jessica Meir and Christina Koch opened up the CAL today to swap and clean hardware inside the quantum research device.

Meir first joined NASA astronaut Andrew Morgan in the Kibo laboratory module to help him set up the Cyclops small satellite deployer. Morgan installed Cyclops, loaded with a Department of Defense experimental satellite, inside Kibo’s airlock for depressurization.

Mission controllers will then remotely command the Japanese robotic arm to grapple and deploy Cyclops outside Kibo overnight. The tiny satellite, packed with a variety of space weather and star tracker experiments, will be deployed into Earth orbit Wednesday morning.

Meir then installed a different small satellite deployer, this one called SlingShot, on the Cygnus space freighter attached to the Unity module. The SlingShot, attached to Cygnus’ hatch, will release a variety of small satellites after the U.S. cargo craft departs the space station on Friday at 9:35 a.m. EST. The suite of eight CubeSats will study different optical and communication technologies as well as atmospheric and natural phenomena.

Koch is getting ready to come home on Feb. 6 with fellow crewmates Luca Parmitano of ESA (European Space Agency) and Alexander Skvortsov of Roscosmos. The trio performed leak checks today on the Sokol launch and entry suits they will wear aboard the Soyuz MS-13 crew ship when they parachute to a landing in Kazakhstan.

Upon landing, Koch will have lived in space continuously for 328 days on her first mission. She will be second only to former astronaut Scott Kelly who lived in space 340 days for the single longest spaceflight by a U.S. astronaut.

Engineers on the ground have begun powering up the Alpha Magnetic Spectrometer’s (AMS) thermal system following a successful repair spacewalk over the weekend. The Expedition 61 astronauts are now preparing a U.S. cargo craft for its departure at the end of the week.

It took four spacewalks over three months to restore and upgrade thermal operations on the AMS. Astronauts Andrew Morgan and Luca Parmitano wrapped up the complex repair job on Saturday for the 8-year-old cosmic particle detector. Soon after the spacewalk, payload controllers reported stable cooling operations on the AMS, and are continuing to monitor its thermal conditions. The AMS will soon resume its search for evidence of dark matter and antimatter once the system checkouts are complete.

The crew are now turning their attention to packing Northrop Grumman’s Cygnus resupply ship with trash and discarded hardware. Robotics controllers in Mission Control will command the Canadarm2 robotic arm to release Cygnus on Friday at 9:35 a.m. EST after 88 days attached to the Unity module. The private cargo carrier will reenter Earth’s atmosphere over the South Pacific for a fiery, but safe disposal.

NASA Flight Engineers Jessica Meir and Christina Koch started Monday on housecleaning tasks. They were joined by Morgan and Parmitano cleaning fans and filters and disinfecting surfaces containing microbes and condensation.

Cosmonaut Alexander Skvortsov is getting the Soyuz MS-13 crew ship ready for its return to Earth on Feb. 6. He will parachute to a landing in Kazakhstan with Koch and Parmitano just three and half hours after undocking from the Poisk module. Koch will have lived in space continuously for 328 days on her first mission, second only to former astronaut Scott Kelly who lived in space 340 days for the single longest spaceflight by a U.S. astronaut.