We take for granted that physical 'constants', such as the speed of light, are fixed values. But they might not be, and experiments in space may allow us to investigate this possibility.
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Lamoreaux, S. Testing times in space. Nature 416, 803–804 (2002). https://doi.org/10.1038/416803a
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DOI: https://doi.org/10.1038/416803a
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