Remember, this was the era of Chariots of the Gods?, and to many, this was confirmation that aliens had either come thru the Solar System and stopped off not only on Earth, but Mars, as well, or were from Mars initially!
And, there were those who remembered this little comic tale from their childhood.
The truth was a bit more mundane. Click HERE for NASA's explanation.
There are those who say it's a cover-up, that there is life on Mars, and that "the face" is a relic of their existence.
Judge for yourself.
Here's some covers featuring a Green Lantern you won't see in the movie...the Golden Age Green Lantern!
But he will be featured in the Monday entry: Of Lanterns and Lensmen, detailing both his Golden Age run and the story of E.E. "Doc" Smith's Lensmen...