Soyuz Undocks from Station, Crew Heads for Earth Return

Soyuz Undocks from Station, Crew Heads for Earth Return

The Soyuz MS-27 crew spacecraft undocks from the Prichal module to return three Expedition 73 crew members to Earth.
The Soyuz MS-27 crew spacecraft undocks from the Prichal module to return three Expedition 73 crew members to Earth.
NASA

At 8:41 p.m. EST, the Soyuz MS-27 spacecraft undocked from the International Space Station’s Prichal module with NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky aboard.  

NASA’s live coverage of deorbit burn, entry, and landing will begin at 10:30 p.m. on NASA+, Amazon Prime, and YouTube. Learn how to stream NASA content through a variety of platforms, including social media. 

The spacecraft will make a parachute-assisted landing at 12:03 a.m. on Tuesday, Dec. 9 (10:03 a.m. local time in Kazakhstan), on the steppe of Kazakhstan, southeast of the city of Dzhezkazgan. 

Learn more about station activities by following the space station blog, @space_station on X, as well as the ISS Facebook and ISS Instagram accounts.

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Mark A. Garcia

Live on NASA+: Soyuz Crew Undocking from Station Soon

Live on NASA+: Soyuz Crew Undocking from Station Soon

The Soyuz MS-27 crew spacecraft is pictured docked to the Prichal module just hours before undocking from the International Space Station and returning three crew members to Earth.
The Soyuz MS-27 crew spacecraft is pictured docked to the Prichal module just hours before undocking from the International Space Station and returning three crew members to Earth.
NASA

NASA’s live coverage of undocking is now underway on NASA+Amazon Prime, and YouTube. Learn how to stream NASA content through a variety of platforms, including social media.

At 5:30 p.m. EST, hatches closed between the Soyuz MS-27 spacecraft and the International Space Station in preparation for undocking and the return to Earth of NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky.

The spacecraft will undock from the orbiting laboratory’s Prichal module at approximately 8:41 p.m. It will make a parachute-assisted landing at 12:03 a.m. on Tuesday, Dec. 9 (10:03 a.m. local time in Kazakhstan), on the steppe of Kazakhstan, southeast of the city of Dzhezkazgan.

Watch NASA’s live coverage of the deorbit burn, entry, and landing, beginning at 10:30 p.m. on NASA+Amazon Prime, and YouTube.

Learn more about station activities by following the space station blog, @space_station on X, as well as the ISS Facebook and ISS Instagram accounts.

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Mark A. Garcia

Hatches Closed, Crew Inside Soyuz Ready to Depart

Hatches Closed, Crew Inside Soyuz Ready to Depart

Soyuz MS-27 crew members (frm left) NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky pose for a portrait at the Gagarin Cosmonaut Training Center in Russia.
Soyuz MS-27 crew members (frm left) NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky pose for a portrait at the Gagarin Cosmonaut Training Center in Russia.
GCTC

At 5:30 p.m. EST, the hatch closed between the Soyuz MS-27 spacecraft and the International Space Station in preparation for undocking and return to Earth.

Watch NASA’s live undocking coverage beginning at 8:15 p.m. on NASA+Amazon Prime, and YouTube. Learn how to stream NASA content through a variety of platforms, including social media.

NASA astronaut Jonny Kim, accompanied by Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky, will undock from the station’s Prichal module at approximately 8:41 p.m., headed for a parachute-assisted landing at 12:03 a.m. on Tuesday, Dec. 9 (10:03 a.m. local time in Kazakhstan), on the steppe of Kazakhstan, southeast of the city of Dzhezkazgan.

Learn more about station activities by following the space station blog, @space_station on X, as well as the ISS Facebook and ISS Instagram accounts.

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Mark A. Garcia

Live on NASA+: Three Crewmates Say Farewell, Set to Depart Station

Live on NASA+: Three Crewmates Say Farewell, Set to Depart Station

From left, NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky will soon depart the International Space Station inside the Soyuz MS-27 crew spacecraft for a landing in Kazakhstan.
From left, NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky will soon depart the International Space Station inside the Soyuz MS-27 crew spacecraft for a landing in Kazakhstan.
NASA

NASA’s live departure coverage is underway on NASA+Amazon Prime, and the agency’s YouTube channel. Learn how to stream NASA content through a variety of online platforms, including social media.

NASA astronaut Jonny Kim and Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky will close the hatch between the Soyuz MS-27 spacecraft and the International Space Station at 5:10 p.m. EST.

The spacecraft will undock from the station’s Prichal module at approximately 8:41 p.m., headed for a parachute-assisted landing at 12:04 a.m. on Tuesday, Dec. 9 (10:04 a.m. local time in Kazakhstan), on the steppe of Kazakhstan, southeast of the city of Dzhezkazgan.

Watch NASA’s live undocking coverage at 8:15 p.m. on NASA+Amazon Prime, and YouTube.

Kim and his crewmates are completing a 245-day stay aboard the station. At the conclusion of their mission, they will have orbited Earth 3,920 times and traveled nearly 104 million miles. The Soyuz MS-27 spacecraft launched and docked with the station on April 8.

This was the first flight for Kim and Zubritsky to the orbiting laboratory, while Ryzhikov is ending his third trip to space. Ryzhikov will have logged a total of 603 days in space, ranking him 13th all time.

Learn more about station activities by following the space station blog, @space_station on X, as well as the ISS Facebook and ISS Instagram accounts.

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Mark A. Garcia

XRISM Finds Chlorine, Potassium in Cas A

XRISM Finds Chlorine, Potassium in Cas A

This image of Cassiopeia A resembles a disk of electric light with red clouds, glowing white streaks, red and orange flames, and an area near the center of the remnant resembling a somewhat circular region of green lightning. X-rays from Chandra are blue and reveal hot gas, mostly from supernova debris from the destroyed star, and include elements like silicon and iron. X-rays are also present as thin arcs in the outer regions of the remnant. Infrared data from Webb is red, green, and blue. Webb highlights infrared emission from dust that is warmed up because it is embedded in the hot gas seen by Chandra, and from much cooler supernova debris. Hubble data shows a multitude of stars that permeate the field of view.
This composite image of the Cassiopeia A (or Cas A) supernova remnant, released Jan. 8, 2024, contains X-rays from Chandra (blue), infrared data from Webb (red, green, blue), and optical data from Hubble (red and white). A study by the XRISM (X-ray Imaging and Spectroscopy Mission) spacecraft has made the first-ever X-ray detections of chlorine and potassium in the wreckage.
X-ray: NASA/CXC/SAO; Optical: NASA/ESA/STScI; IR: NASA/ESA/CSA/STScI/Milisavljevic et al., NASA/JPL/CalTech; Image Processing: NASA/CXC/SAO/J. Schmidt and K. Arcand

The Cassiopeia A supernova remnant glows in X-ray, visible, and infrared light in this Jan. 8, 2024, image that combines data from NASA’s Chandra X-ray Observatory and Hubble, Webb, and Spitzer space telescopes. A study by the XRISM (X-ray Imaging and Spectroscopy Mission) spacecraft has made the first-ever X-ray detections of chlorine and potassium from the wreckage; a paper about the result was published Dec. 4, 2025, in Nature Astronomy.

Read more about this discovery.

Image credit: X-ray: NASA/CXC/SAO; Optical: NASA/ESA/STScI; IR: NASA/ESA/CSA/STScI/Milisavljevic et al., NASA/JPL/CalTech; Image Processing: NASA/CXC/SAO/J. Schmidt and K. Arcand

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Jeanette Kazmierczak