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Later observations

These observations indicate Triton has a warm southern-hemisphere summer season that only happens once every few hundred years, near solstices. Hypotheses for this warming include the sublimation of frost on Triton's surface and a decrease in ice albedo, which would allow more heat to be absorbed. Another theory argues the changes in temperature are a result of the deposition of dark, red material from geological processes on the moon. Because Triton's bond albedo is among the highest within the solar system, it is sensitive to small variations in spectral albedo.