Expedition 73

Expedition 73
	Axiom Mission 4 crew in black jumpsuits with Expedition 73 crew in white shirts
Mission type	Long-duration expedition
Operator	NASA / Roscosmos
Mission duration	75 days, 1 hour and 55 minutes (in progress)
Expedition
Space station	International Space Station
Began	19 April 2025
Ended	8 December 2025
Arrived aboard	Soyuz MS-27; SpaceX Crew-10; Soyuz MS-28; SpaceX Crew-11;
Departed aboard	Soyuz MS-27; SpaceX Crew-10;
Crew
Crew size	7–11
Members	Expedition 72/73:; Anne McClain; Nichole Ayers; Takuya Onishi; Kirill Peskov; Sergey Ryzhikov; Alexey Zubritsky; Jonny Kim; Expedition 73/74:; Zena Cardman; Michael Fincke; Kimiya Yui; Oleg Platonov; Sergey Kud-Sverchkov; Sergey Mikayev; Christopher Williams;
EVAs	1
EVA duration	5 hours, 44 minutes
	; Expedition 73 mission patch; ; Left to right, top row: Peskov, Kim, Ryzhikov, Zubritsky and Onishi. Bottom row: Ayers and McClain. Expeditions ← Expedition 72 Expedition 74 →

Expedition 73 is the 73rd long-duration expedition to the International Space Station (ISS). The expedition began with the departure of Soyuz MS-26 on 19 April 2025 with JAXA astronaut Takuya Onishi taking over the ISS command.^[1] It continues the extensive scientific research conducted aboard the ISS, focusing on various fields, including biology, human physiology, physics, and materials science. The crew members also maintain and upgrade the space station systems.

On 26 June, 2025, the crew was joined by the staff of Axiom Mission 4's Crew Dragon Grace: commander Peggy Whitson of the United States, pilot Shubhanshu Shukla of India, and mission specialists Sławosz Uznański-Wiśniewski of Poland and Tibor Kapu of Hungary.^[2]^[3] Their mission marks India, Poland, and Hungary's return to crewed spaceflight for the first time in over 40 years.^[4] During their two-week stay aboard the ISS, the astronauts will carry out 60 experiments planned by 31 different countries.^[3]^[5]

Crew

Flight	Astronaut	Increment 73a	Increment 73b	Increment 73c	Increment 73d
Flight	Astronaut	19 Apr-Aug 2025 (ongoing)	Aug 2025 (planned)	Aug-27 Nov 2025 (planned)	27 Nov-8 Dec 2025 (planned)
Soyuz MS-27	Sergey Ryzhikov, Roscosmos Third spaceflight	Flight Engineer
	Alexey Zubritsky, Roscosmos First spaceflight	Flight Engineer
	Jonny Kim, NASA First spaceflight	Flight Engineer
SpaceX Crew-10	Anne McClain, NASA Second spaceflight	Flight Engineer		Off Station
	Nichole Ayers, NASA First spaceflight	Flight Engineer		Off Station
	Takuya Onishi, JAXA Second spaceflight	Commander		Off Station
	Kirill Peskov, Roscosmos First spaceflight	Flight Engineer		Off Station
SpaceX Crew-11 (planned)	Zena Cardman, NASA First spaceflight	Off Station	Flight Engineer
	Michael Fincke, NASA Fourth spaceflight	Off Station	Flight Engineer
	Kimiya Yui, JAXA Second spaceflight	Off Station	Flight Engineer
	Oleg Platonov, Roscosmos First spaceflight	Off Station	Flight Engineer
Soyuz MS-28 (planned)	Sergey Kud-Sverchkov, Roscosmos Second spaceflight	Off Station			Flight Engineer
	Sergey Mikayev, Roscosmos First spaceflight	Off Station			Flight Engineer
	Christopher Williams, NASA First spaceflight	Off Station			Flight Engineer

References

^ "大西卓哉宇宙飛行士のISS船長（ISSコマンダー）就任決定" [Astronaut Takuya Onishi appointed as ISS Commander]. JAXA (in Japanese). 2 December 2024. Retrieved 24 December 2024. [ We are pleased to announce that Takuya Onishi, an astronaut from the Japan Aerospace Exploration Agency (JAXA), has been selected as the ISS commander for the International Space Station (ISS) Expedition 73. Astronaut Onishi will be the third Japanese ISS commander and will lead the ISS during the Expedition 73 mission.]
^ "Axiom Mission 4". nasa.gov. NASA. Retrieved 25 June 2025.
^ ^a ^b Harwood, William (26 June 2025). "Ax-4 crew docks with International Space Station after 28-hour rendezvous". cbsnews.com. CBS News. Retrieved 27 June 2025.
^ "India, Poland, Hungary make spaceflight comeback with ISS mission". france24.com. Agence France-Presse. 25 June 2025. Retrieved 27 June 2025.
^ "Polska na orbicie. Misja IGNIS wystartowała!". gov.pl. Ministerstwo Rozwoju i Technologii. 25 June 2025. Retrieved 25 June 2025.

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[1] "大西卓哉宇宙飛行士のISS船長（ISSコマンダー）就任決定" [Astronaut Takuya Onishi appointed as ISS Commander]. JAXA (in Japanese). 2 December 2024. Retrieved 24 December 2024. [ We are pleased to announce that Takuya Onishi, an astronaut from the Japan Aerospace Exploration Agency (JAXA), has been selected as the ISS commander for the International Space Station (ISS) Expedition 73. Astronaut Onishi will be the third Japanese ISS commander and will lead the ISS during the Expedition 73 mission.]

[2] "Axiom Mission 4". nasa.gov. NASA. Retrieved 25 June 2025.

[axdock-3] Harwood, William (26 June 2025). "Ax-4 crew docks with International Space Station after 28-hour rendezvous". cbsnews.com. CBS News. Retrieved 27 June 2025.

[4] "India, Poland, Hungary make spaceflight comeback with ISS mission". france24.com. Agence France-Presse. 25 June 2025. Retrieved 27 June 2025.

[5] "Polska na orbicie. Misja IGNIS wystartowała!". gov.pl. Ministerstwo Rozwoju i Technologii. 25 June 2025. Retrieved 25 June 2025.

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v t e Expeditions to the International Space Station
See also: Crewed ISS flights Uncrewed ISS flights
2000–2004	Expedition 1 2 3 4 5 6 7 8 9 10	International Space Station Emblem
2005–2009	Expedition 11 12 13 14 15 16 17 18 19 20 21 22
2010–2014	Expedition 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
2015–2019	Expedition 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
Since 2020	Expedition 62 63 64 65 66 67 68 69 70 71 72 73 74+
Related	List of spaceflights to the ISS List of ISS visitors crew commanders visiting expeditions
Displayed and current expeditions are in underline Future expeditions in italics Category List