Amazing moon-shaped ice crystal formation appears on ISS window

A photo taken from a window on the International Space Station by Russian cosmonaut Sergei Korsakov shows a unique ice formation.

Published Fri, May 27 2022 6:09 AM CDT   |   Updated Fri, Jun 17 2022 12:15 AM CDT

Russian cosmonaut Sergei Korsakov has shared a remarkable photo from his view through one of the International Space Station (ISS) windows.

The picture shows ice crystals forming in a pattern very reminiscent of the moon on the inside of a window in the space station, though the real moon is nowhere to be seen in the photo. Beneath the formation is an out-of-focus Earth, peeking into the shot.

Amazing moon-shaped ice crystal formation appears on ISS window 02 |

After uploading the original photo to Twitter and Telegram, Korsakov posted a follow-up photo the next day. Korsakov's accompanying caption said, "the adventures of the frosty space pattern continue!" and noted that though "the frost has melted, but the condensation pattern remains."

NASA scientist Andrew Hong has previously said that the space station's "windows are a tremendous heat leak, but astronauts need them for ergonomics and also for their research." Similar to the way car windows frost over, it is plausible that as heat radiates away from the windows, they become cool enough for moisture on the window, perhaps from an astronaut's breath, to then freeze.

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