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Norman Sperling
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The Straight Dope on the Straight Wall

© Norman Sperling, June 29, 2012

Technology has now improved so much that a coordinated observing campaign can reveal important new data about one of the Moon's most important features: The Straight Wall.

First, data-mine all spacecraft observations, including Chinese and Indian. Face-on, sunlit views from spacecraft should be able to identify distinct layers. I haven't heard of anyone specifically researching these about the Straight Wall.

Monitor the Moon from Earth, using high-magnification, high-resolution imaging, especially of sunrise and sunset along the cliff. Use several widely separated instruments, so that there should always be at least one with good weather and the Moon high enough in its sky. This requires global coordination. That would have been very unusual 30 years ago, but is clearly possible now.

Extremely detailed sunrise and sunset animation sequences, from different librations, should reveal nearby faulting, or prove there isn't much.

Use the animations to map the slope and its component boulders. Precision measuring at sunrise and sunset, boulder by boulder, should determine elevation as well as latitude and longitude. I predict the boulders should be very large compared to Earth's talus slopes. That's because the rocks should be about as strong as similar Earth rocks, but the Moon's lower surface gravity exerts less force to break them up.

Spectral differences should distinguish between pieces from the top stratum and pieces from lower strata, hopefully corresponding to understandable mineralogical differences between strata. Infrared observing after sunset might reveal different cooling rates, further revealing differences between boulders.

Examining the buildup of dust at the bottom will tell something about dust scattering rates (such as by electrostatic levitation on the terminator) since landslides.

All this is possible with the latest generation of electronic imaging and enhancement. It's time to try.

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