A homogeneous nucleus for comet 67P/Churyumov-Gerasimenko from its gravity field.


Cometary nuclei consist mostly of dust and water ice. Previous observations have found nuclei to be low-density and highly porous bodies, but have only moderately constrained the range of allowed densities because of the measurement uncertainties. Here we report the precise mass, bulk density, porosity and internal structure of the nucleus of comet 67P… (More)
DOI: 10.1038/nature16535


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