May 23, 2007, HiRISE release |
May 23, 2007, HiRISE release |
Guest_AlexBlackwell_* |
May 23 2007, 04:01 PM
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May 24 2007, 12:42 PM
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Regarding that overhang:
We are told that the sun was 38 degrees above the horizon, or 52 degrees from zenith. This means that if the angle of overhang was less than 52 degrees from the vertical the sun would be directly illuminating part of the overhang wall surface underneath the visible rim. This would add significantly to the level of downward illumination inside, so my guess is it's not happening. That makes the angle of overhang quite severe and the rim quite thin. The direct sunlight entering through the skylight would then be falling on the floor of the cavern some distance down-sun. The light scattered from that bright spot would then be shining upward, illuminating the interior roof but not the part of the floor in our line of sight. |
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