When Sojourner went to Mars, Marie Curie, its less-famous twin, stayed home on Earth. NASA used Marie Curie to mimic Sojourner’s movements in a Mars-like setting, testing algorithms and strategies.
https://spectrum.ieee.org/mars-pathfinder-rover

This Little Rover Captivated Our Hearts and Paved the Way for Mars Exploration
In 1997, the Mars rover Sojourner captivated millions as it explored the Red Planet, sending back photos and performing chemical analyses. Its twin, Marie Curie, remained on Earth, aiding NASA's mission. Both rovers symbolize the pioneering spirit that continues to inspire.
spectrum.ieee.org · IEEE Spectrum
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