Google Mars is a website like Google Earth, but users can zoom in on satellite imagery of the Martian surface.
If certain coordinates are used it shows an artificial colony of white buildings powered by solar panels.
Users can even zoom inside the buildings, showing it is a genuine artificially-built complex.
But there’s little chance of an imminent alien attack as the images are fake and were uploaded to Google Mars, by Google for an April Fools Day joke this year.
The internet giant released a fictitious story at the time to say it had set up a storage facility on Mars.
However, a series of conspiracy theory videos have emerged on YouTube, questioning if the complex could actually exist.
Some questioned if the April Fools story was actually a double bluff to convince people the actual existence of the facility was a joke.
Conspiracy theory website Disclose.tv ran an article entitled “What? Human Martian Facilities Exposed by Google Mars.”
It said: “These buildings that rely on solar panels, continuous power, and radio parabolic antenna.
“There are also images of the interior of these images, which makes us think that this is a joke by NASA.
“Google/NASA making fun of us or what?
“What does it mean to manipulate images of a scientific ecosystem?
“Do you want to make fun of people? Are you going to bury the truth in 1,000 lies?
“Typical psyop to hide the truth?