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These comet nuclei are usealy small prolate ellipsoids of low albedo. The axis ratios range

between 1.1,2.6 which when combined with rotation periods constrains the density lower limits.

Big image
Comet Comming


nuclei are found to have very small fractional active spotes. There isn’t very much evidence that has been seen, however, the results to date suggest a strengthless agglomeration of

gravitationally bound planetesimals with a bulk density between 0.5