Experts have spotted what they say looks like a book on the Red Planet. NASA’s Curiosity Mars rover captured a close-up view of a rock nicknamed “Terra Firme” last month.
The rock is about an inch across (2.5 cm) and the space agency report "looks like the open pages of a book".
The rover used its Mars Hand Lens Imager (MAHLI) on the end of its robotic arm to snap the puzzling picture on April 15, or the 3,800th Martian day.
