It appears this may have been circulating for some time, but there is an image from the HiRISE camera from NASA that "suggests" the object in the image is alien in nature. To me it could be anything, but is one of the more interesting images I've seen that seem to fool your eyes into seeing (perhaps) something that is not there.

hay buzz aldrin has some interesting comments to make on these (on youtube) he says some other interesting things too...

I speculate that's it's a rock.

More odd-shaped rocks that look like something when viewed from afar.

 

Lets pretend that its aliens that shaped the rock/structure and that they are grays and they have fleets of spaceships ready to invade somewhere like, ummm, can't think of a place, oh, yes I can, they are going to invade EARTH! And, we must get ready to receive our new overlords and to work in mines to mine diamonds for them.

If you zoom the image can read in the back "Made in China"

If you zoom the image can read in the back "Made in China"

 

These days even the Martians are outsourcing labor to China!