Caves on Mars: illuminated

Earlier in the year I mentioned the amazing pictures of the round holes that had been found on Mars. At the time it was thought that they were likely to be pits with steep sides. Now, Tom reports on a new image which shows some of the wall of the pit illuminated by a low Sun. Given the inclination that the image was taken at, the angle of the Sun and the amount of exposed pit wall, the HiRISE team reckon the pit is at least 78 m (255 ft) deep. That makes it at least half as deep as it is wide (the diameter is about 150 m). At the bottom right of the image of the pit there seems to be a region within the shadow that is not fully dark. To me that suggests that it may be illuminated by light reflected from the sunlit wall.

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Posted in astro blog by Stuart on Thursday 06th Sep 2007 (17:57 BST) | Permalink
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