At Earth's Edge: Comet C/2023 A3 | International Space Station

At Earth's Edge: Comet C/2023 A3 | International Space Station

Expedition 71/72 flight engineer and NASA astronaut Don Pettit: "Comet C/2023 A3 on atmosphere's edge, as seen from the ISS."

NASA astronaut Don Pettit returned to Earth on April 19, 2025, concluding a seven-month science mission aboard the International Space Station. Pettit spent 220 days in space, earning him a total of 590 days in space over the course of his four spaceflights. He orbited the Earth 3,520 times, traveling 93.3 million miles in low-Earth orbit.

Follow Expedition 73:

https://blogs.nasa.gov/spacestation/

Expedition 73 Crew

Station Commander: Sergey Ryzhikov (Roscosmos)

JAXA Flight Engineer (Japan): Kimiya Yui

Roscosmos (Russia) Flight Engineers: Alexey Zubritskiy, Oleg Platonov

NASA Flight Engineers: Jonny Kim, Zena Cardman, Mike Fincke

An international partnership of space agencies provides and operates the elements of the International Space Station (ISS). The principals are the space agencies of the United States, Russia, Europe, Japan, and Canada.

Learn more about the important research being operated on Station:
https://www.nasa.gov/iss-science

For more information about STEM on Station:

https://www.nasa.gov/stemonstation
Science, Technology, Engineering, Math (STEM)

Image Credit: NASA's Johnson Space Center/D. Pettit
Release Date: Sept. 27, 2025

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