An exotic arrow-shaped cloud was discovered in the atmosphere of Saturn's moon Titan last year. Numerical modelling shows how a large-scale atmospheric wave can naturally shape tropical clouds to such an arrow.
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Tokano, T. Arrow in Titan's sky. Nature Geosci 4, 582–583 (2011). https://doi.org/10.1038/ngeo1236
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DOI: https://doi.org/10.1038/ngeo1236
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