I believe it was Dr. Halliday, that had a discussion about speleothems outside of caves.
Here appears to be something that resembles a shield formation on the surface of the comet, comet 67p/churyumov-gerasimenko: https://www.dropbox.com/s/3yxp9fp2ykz6psx/shield.jpg?dl=0 My guess is that it is 400 meters in diameter, plus or minus 100 meters. David Locklear
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