On Earth, knowing the time feels simple. Your phone pings the same second as a GPS satellite and an atomic clock in a lab. Everything is wired together so well that you rarely think about the ...
The National Institute of Standards and Technology (NIST) fulfills a vital role in national security: employing the sort of people who would, if they got bored, take over the world. It takes a ...
Free-return trajectory – a path that loops around the Moon and returns to Earth without propulsion Permanently shadowed regions – areas near the lunar poles that never receive sunlight and may contain ...
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