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I wouldnt drive down there
I dunno - The near side is nowhere as steep as the far side - just compare the cliff overhangs of the far side with the relative slope on this side. Also keep in mind that Opportunity is on an uphill slpe just at the edge, so it looks steeper than it is.
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I dont see any side less than about 40 degrees at the top - even though it levels out quite nicely towards the bottom
Just compare the horizon level with the slope a bit to the left of the rover, it looks like 20 degrees at most. That may be the best possible entry point if they want to get inside.
Of course, the most interesting geological features are on the steep far side...