Astronaut Kate Rubins recently installed new lighting in the International Space Station (ISS) crew quarters that could help her successors in space survive a mission to Mars. Known as a solid-state lighting assembly (SSLA), the device emits light in wavelengths that can be tuned to help space travelers get a better night’s sleep. The SSLA is a simple example of the complex testing underway on the ISS as NASA and its international partners prepare for eventual human travel to ...

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