Last week’s landing of NASA’s Perseverance rover on the Martian surface reminds us of how life on Mars has long been an object of fascination here on Earth, from ancient times through David Bowie up until today. The Perseverance mission is just the latest to explore whether or not conditions in the Martian past or future could support human life. The SUV-sized Perseverance is not alone on Mars. There are currently 11 spacecraft visiting the red planet — more than enough for a minyan — including eight in orbit and three on the planetary surface. It’s a veritable United Nations of space junk up there, with projects sponsored by India, Russia, Europe, the UAE, China and the U.S.