Yep. This sentence in the first photo caption caught me off guard...

"The Milky Way system, called galaxis, resembles a gigantic spiral with an estimated 200 billion stars. One of them is our sun."

I've been an avid astronomy nerd since I was 5 (and I'm almost ten times that age now) and never heard the term "galaxis". The only reference I could find on Google was to the highly acclaimed movie of that name:

https://www.imdb.com/title/tt0113140/

Now I realize they just didn't translate the word "galaxy" when they translated the text to English.

I think "galaxis" is the ancient latin term. Either way, the word "galaxy" is derived from ancient greek and "milky way" is an almost literal translation.