NASA's plan to return Martian rocks is in trouble. Could these 7 companies help?

As the Perseverance rover rumbled over Mars terrain scoping out rocks, seven companies spent the summer trying to figure out how to help NASA bring its samples back to Earth. The U.S. space agency's mission to return bits of rock, dust, and even air from the Red Planet, known as Mars Sample Return, is in trouble. An independent review found the unprecedented project would cost upward of $11 billion and take nearly two decades to accomplish. Problems with the mission's management came a