Fig. 1.
Cometary nuclei imaged from spacecraft encounters or ground-based radar. Panel a: 67P/Churyumov-Gerasimenko. Image credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/ INTA/UPM/DASP/IDA. Panel b: 9P/Tempel 1. Image credit: PIA02142, Courtesy NASA/JPL-Caltech. Panel c: 103P/Hartley 2. Image credit: PIA13570, Courtesy NASA/JPL-Caltech. Panel d: 19P/Borelly. Image credit: PIA03500, Courtesy NASA/JPL-Caltech. Panel e: 1P/Halley. Image credit: ESA/MPS. Panel f: 81P/Wild 2, see Duxbury et al. (2004). Panel g: 8P/Tuttle. Image credit: Arecibo Observatory Planetary Radar, resolution 1 μs × 0.5 Hz, see Harmon et al. (2010).
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