Lunar laser tools aid spacecraft navigation

American researchers have proposed utilizing the permanently shadowed polar craters on the Moon, which are covered in everlasting shadows and contain water ice, to build ultra-stable lasers that could support a highly precise lunar timekeeping system. These lasers could serve as a time reference meeting the accuracy of the most precise atomic clocks on Earth, while also supporting satellite navigation systems and enabling robust quantum networks. Additionally, these craters' low fire risk and minimal vibrations would enhance stability. The study suggests that assembling laser components in these regions could be performed automatically, possibly using silicon cavities cooled to 16 Kelvin, making the system extremely stable and accurate.

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