I use the term "alien" because of the fact we have been told we have never visited the surface of Ganymede, Jupiter's largest moon. And what you see on the surface is clearly not natural, these are intelligently placed structures and the dark gray object to the far left resembles, at least to me, the body of a C-131 Hercules Military Aircraft.

Ganymede also has a magnetosphere similar to Earth's.

I ran across this in some research images I had saved from 2013. I forgot I had them because the computer decided one night to totally upgrade my OS and in the process put these images in a completely different place in my laptop. I was a little upset at the time because after the update (that I did not want) it completely changes the Movie Maker I use to a very different version making me to have to learn it all over again. I had these images in a video project of the old version of Movie Maker and there they were!