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The engineering models of both the Curiosity Mars rover (foreground) and the Perseverance Mars rover share space in the recently expanded garage at the Mars Yard. Curiosity's Earthy double is called MAGGIE, short for Mars Automated Giant Gizmo for Integrated Engineering; Perseverance's double goes by OPTIMISM (Operational Perseverance Twin for Integration of Mechanisms and Instruments Sent to Mars). The Mars Yard simulates Martian terrain and has served as a testing ground for many fully-engineered rover twins – from the very first, tiny Sojourner that landed on Mars in 1997 to the Spirit and…
