NASA's Mars rover drops 10th & final sample tube, completes depot

NASA's Perseverance rover has dropped the 10th and final sample tube on Mars, completing the first "sample depot on another world". "Ten sample tubes, capturing an amazing variety of Martian geology, have been deposited on Mars' surface so they could be studied on Earth in the future," NASA said. Each sample is about 5-15 metres apart from one another.