The shape of comet 67P/Churyumov-Gerasimenko is intriguing and chaotic. What size do comets or asteroids need to be before they start to develop an orb-like shape, and what are the processes involved?
Malvina Moray, Doune, Perthshire, UK
This article appeared in print under the headline 鈥淪hape of things to come鈥�
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