14. Is that a fish fossil or just a rock?
Interestingly, the surface of Mars held an ocean that was larger than the Arctic Ocean found on Earth. In 2016, NASA’s Curiosity rover took a picture of an image that closely resembled a fish. Many people took this as evidence that the Red Planet used to have aquatic inhabitants.
Researchers believe that the fish fossil is nothing more than a uniquely shaped rock. The lighting in the stone’s image and shape make it resemble a swimming fish with an upturned nose and finned tail. While it would be fun to learn that fish once swam happily in Mars’ ocean, it’s more likely that this fish fossil is just an optical illusion.