[X] My Assistant

[SFJCody]

Seems to be a lot of dispute on this subject... I think it's ice from the interior, but what does everyone else think?

Edit:

This world seems very complex so the question could perhaps be phrased as 'which of these options is most responsible for the Iapetan dichotomy?'

[Bill Harris]

My first, and continuing, impression of the dichotomy on Iapetus is that the object got splatted with a cosmic tomato. It looks like something was spattered, sputtered or applied to the leading side.

I've found my first example of an impact on the white snowy areas leaving rays from the dark reqolith. N00092009, located in the Voyager Mountains. Looks like an impact dead-centered on a peak.

I did an "RGB" composite image from IR1-GRN-UV3 frames taken at the time. Registration was poor, colr balance was pitiful and I won't inflict it upon you, but the color value of the rays was the same as the weathered regolith surface. An observation presented FWIW.

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[David]

I've found my first example of an impact on the white snowy areas leaving rays from the dark reqolith. N00092009, located in the Voyager Mountains. Looks like an impact dead-centered on a peak.

I don't have a problem believing that in that case we have dark layered on top of white which is in turn (over on the opposite side from the impact site) layered on top of dark again.