Wikipedia – NASA’s Mars Exploration Rover (MER) mission is an ongoing robotic space mission involving two Mars rovers, Spirit and Opportunity, exploring the planet Mars. It began in 2003 with the sending of the two rovers: MER-A Spirit and MER-B Opportunity—to explore the Martian surface and geology. Both rovers outlived their planned missions of 90 Martian solar days by far. MER-A Spirit was active until 2010. MER-B Opportunity is still active. The success of the two MERs led to another mission, sending a bigger rover Curiosity in 2012. #NASA
Is taking the road less traveled strategy or a tactic?