Balloon experiments over Antarctica have produced a long-awaited temperature map of the microwave sky. The map reveals sound waves that can be used to probe the early Universe.
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Hu, W. Ringing in the new cosmology. Nature 404, 939–940 (2000). https://doi.org/10.1038/35010242
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DOI: https://doi.org/10.1038/35010242
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