In answer to your observation regarding an arm. .from the snippet:
“reconstructed from 55 frames while digitally removing an extended arm.”
I noticed the arm was missing, too, but then I read the paragraph.
Jeez - now I’m supposed to read EVERY sentence of a post?! And I thought I was doing so much better by at least skimming them instead of just looking at the headlines!
Funny though. 30 years ago I would have found it amazing that you could splice all those photos together so well, and edit out the arm. Much less photos from Mars!
What else did they digitally remove?