Before and after perihelion images are a great way to verify theories about the connection between outbursts/outgassing/dust flow and the physical evidence of effects on the cometary nucleus surface. Figure 8 from the following paper:
'Are fractured cliffs the source of cometary dust jets? Insights from OSIRIS/Rosetta at 67P/Churyumov-Gerasimenko.'
Vincent, J.-B., et al.
http://arxiv.org/pdf/1512.03193.pdf
Vincent, J.-B., et al.
http://arxiv.org/pdf/1512.03193.pdf
shows a before and after. However, after discussing features *thought* to be fractured cliffs and their detritus, the before and after images show what is *thought* to be evolving flows and *thought* to be partial collapse of a fractured cliff without detritus evidence.
Little effort is made to connect the dots for the reader to try to work out for themselves exactly what is happening and why. I think surface changes are the most fascinating things about comets.
Following is the images and annotations from this blog about a fairly clear overhang collapse.
Further down are the original images for context and for the reader to work out changes/evolution for themselves.
 |
| After |
FOR NAVCAM
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
To view a copy of this licence please visit:
http://creativecommons.org/licenses/by-sa/3.0/igo/
FOR OSIRIS
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DyASP/IDA/
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