Quote:
Originally Posted by CraigS
Epimetheus' mean density is only 0.69 ± 0.11 g/cm³, Janus' is 0.64 ± 0.06 g/cm³ (note the small error terms !), which I think, together with surface Albedo measurements result in the conclusion that they are very porous ! …. cheers
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Or made out of styrofoam!!!!
Very porous and made out of mostly ices.