Aliens might have sent messages by tweaking variable stars.
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Learned, J. G., Kudritzki, R.-P., Pakvasa, S. & Zee. A. Preprint at http://arxiv.org/pdf/0809.0339v2 (2008).
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Choi, C. 'Galactic internet' proposed. Nature (2008). https://doi.org/10.1038/news.2008.1091