Have you seen the weird “alien doorway” on Mars image that went viral on social media? It was sent back by NASA’s Curiosity rover on May 7, 2022 as it traveled through the red planet’s ...

For years, the U.S. space agency's Perseverance rover has been scouring Mars and scooping up intriguing rock samples. Some of those samples have been stashed away in cylindrical tubes on the ...