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TIL: Vega-1 and Vega-2 did ~10,000 km and ~8,000 km flybys of Halley’s Comet. Vega-2’s photo of the potato-shaped nucleus is stunning.

Halley looks eerily similar to Churimov-Gerasimenko [0] in that image! I wonder if this dumbbell shape is common in comets and why should that be.

specifically with regard to your question, you may find this research interesting: https://www.nature.com/articles/srep07660