We still rely on old, inefficient, and slow chemical rockets to travel from planet to planet, severely hampering our ability to explore outer space. Nuclear propulsion can help. But the Outer Space Treaty banned the use of high-power nuclear devices in space. This could be about to change. See https://wlockett.medium.com/nuclear-space-propulsion-is-about-to-be-unlocked-bc5f8c2cc56e
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