Giant rectangular buildings that turned out to be artefacts of Google stitching images from different sources together.
Giant circular openings into the interior of Mars that were just craters and my favourite which was a gigantic metallic disc that turned out to be a very dull and irregular hill.
K-9 is sleeping next to them.
It might just take some time.
Also we know this creature flies because there is another one in the far distance behind the cave in the sky.
The Mars rover Curiosity on the surface of the planet.
Astrobiologists flowing from beneath the planet's surface, like swamp gas or a burp, in January 2009.
Red and rocky surface of Mars taken from the Pathfinder.