Discovering gravitational waves would not only validate Einstein's theory of gravitation but also reveal aspects of the Universe's earliest moments. The hunt for these elusive ripples is now well under way.
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Kamionkowski, M. Gravity ripples chased. Nature 460, 964–965 (2009). https://doi.org/10.1038/460964a
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DOI: https://doi.org/10.1038/460964a