???

[McAngus]

[caprarom]

Hmmm - my eyes are not what they used to be, Augusto. Not sure to what the "?" refers. Perhaps the vertical (12:00) streak that is unique from all the parallel 1:00 streaks in that view?
Mike

[McAngus]

The strange symbol inside the red circle, similar to a reflected "E"

[caprarom]

Oh! Now I see it plain as day. Thanks, Augusto. Obviously, your mind is quicker to pick out such images. That does look like a very precise and distinct engraving or stamp. Perhaps a message ... ? Best wishes,
Mike

[McAngus]

Perhaps a message ... ?

Do you mean an alien message?
Something like "Encroachment" or "Entrapment" or other?

[caprarom]

Exactly!

[TitritEL]

Its just an optical illusion brain starts to create images we want to see in such shape and that is normal it even happened to the Great Astronomer William Herschel who seen craters in the moon and thought they were canals made by Lunarians Extraterrestrial inhabitants of the moon and not by powers of physics and chemistry interactions and reactions in outerspace. i Seen a couple of weird things myself in the Aerogels and Foils but not after i know it happened to William Herschel too hope this helped

also the face of monkey in Mars thing here :

<link rel="canonical" href="https://www.space.com/17191-face-on-mars.html">

[McAngus]

Usually these strange signs are the signatures of the technicians that work to the microscope.
Here I report three old images and text from the Red Team Forum.
---------------------------
Dan,

the letter "C"

.... another "leftover impression of a needle"?
Let me know!
Ciao
Augusto



---------------------------

Hi Dan,
why did you hide that the nobleman "Don Diego de la Vega" was a duster too?



---------------------------

ZORRO
CATWOMAN.....
...and now the letter G


mmmmmh!

Bill Gates? Mel Gibson? Zack Gainsforth?

Zack, probably!

[DanZ]

It does look human-made, that is for sure. And so I've inquired! Dan