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Voyager, Pathfinder, Cassini. Humanity has sent out dozens of plucky little space probes to explore our solar system. But when these robots need to call home, who’s listening in?

Perched high atop a giant shiny dish, sits a strange top hat. This hat is filled with high pressure steam, and it’s the secret to efficient solar power that can work even after the Sun sets. Welcome to the world of concentrated thermal energy.