Our moon might not be the only thing in outer space made of cheese.

Images taken by NASA’s Mars Curiosity rover show that the Red Planet appears to have a mouse problem, according to an amateur astronomer.

The image looks like a “possible gigantic mouse or other rodent on Mars in Gale Crater sitting on a ridge plain as day,” Joe White writes on his YouTube channel, ArtAlienTV.

He quickly adds the more plausible explanation: that the object is “probably an optical illusion.”

Still, White insists, “other people including myself have found rodents up there before so it could be. Estimated size 2 – 3 feet.”

The Curiosity rover has spent more than three years studying the planet, and whether it can support life — rodent or otherwise.