380K views · 608 reactions | Say hello to OPTIMISM, the twin of NASA's Perseverance Mars Rover. This test rover is ready to roll here on Earth in our replica Martian landscape — the Mars Yard — and will be used to make sure hardware and software are working properly before Perseverance uses them on the Red Planet. go.nasa.gov/3i1uSwZ | NASA Jet Propulsion Laboratory | Facebook