Dinosaurs may have ruled the Earth, but did they roam on Mars? NASA’s Perseverance rover has spotted a rock so intriguing ...

On Earth, we can punch an address into Google Maps and be on our way in seconds. But plotting a course for NASA's Perseverance rover, 140 million miles away on Mars, is significantly more difficult.

What is there when there is nothing except an empty atmosphere? A NASA scientist would likely say this as the answer. Hundreds of millions of miles away, where there is nothing but an empty world of ...