Use of こと in the following sentence with 果たしたこと


> そのことで日本のだれに何をいわれようが、女房が宇宙任務を **果たしたこと** には変わりがなかったのだ。

I'm not sure what role こと plays in this sentence. I heard that it sometimes
means like a rule, or something that must be done.

My nearest guess here as to a translation here is:

> No matter what anyone in Japan would have said, the fact that my wife
> managed to become and astronaut would not change.




> 宇宙任務を果たしたこと

宇宙任務 sounds a bit weird and ambiguous, but this phrase means "the fact that
(she) have completed her space/astronaut's mission."

I think the other part of your translation is OK.

