In 2018, Elon Musk put a Tesla in space. Like many of the billionaire’s antics, it was a publicity stunt. However, it pointed to an undeniable truth: the future of space travel is electric.   Most spacecraft today — like cars and trucks back on Earth — burn chemicals to get around. But space agencies like NASA, ESA, and France’s CNES have been experimenting with electric thrusters for decades, in a bid for a cleaner, more efficient way to propel satellites. A few startups have spun out from this work. One of them is Paris-headquartered ION-X. It hopes to build the…

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