The pristine interior of comet 67P revealed by the combined Aswan outburst and cliff collapse : Nature Astronomy

The pristine interior of comet 67P revealed by the combined Aswan outburst and cliff collapse : Nature Astronomy
▻http://www.nature.com/articles/s41550-017-0092

Figure 1: The Aswan cliff outburst.

http://www.nature.com/article-assets/npg/natastron/2017/s41550-017-0092/images_hires/m685/s41550-017-0092-f1.jpg

a, OSIRIS NAC reference image taken on 4 July 2015. The Aswan cliff location on the main body of 67P is indicated by the red spot in the upper miniature. No bright features appear on the cliff yet.
b, NavCam image taken on 10 July 2015. The white arrow shows the outburst that occurred in the Aswan area. The usual observed jet activity occurring over the illuminated side of the comet is also visible.
c, OSIRIS NAC image obtained on 15 July 2015 showing the bright, pristine material on the cliff.
d, OSIRIS NAC image taken on 26 December 2015, depicting the bright Aswan cliff.

Figure 2: The Aswan cliff pre- and post-collapse.

https://www.nature.com/article-assets/npg/natastron/2017/s41550-017-0092/images_hires/w926/s41550-017-0092-f2.jpg

NAC images taken at different spatial scales (0.1–0.5 m per pixel) showing the Aswan cliff and fracture setting before (a, b, d and e) and after (c and f) the collapse. The white circle shows the same boulder in all images. The white arrows show the fracture before the collapse and the new sharp edge after the collapse. The white box in c marks the location shown in Supplementary Fig. 1.