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The reason for the radio signals is due to the hydroxyl radicals in the comet's coma. That's the little fuzzy patch around the nucleus that sublimation is lighting up. So you see this fuzzy little green patch, blue-green patch. These radicals formed from the breakdown of water molecules as they were spewed from the comet As the comet got closer to the sun, solar radiation broke down the water, particles near the sun, which was perihelion.