re: Two questions
Yeah, it's pretty much wall-to-wall "blueberries" out there. An astronaut walking in dirt areas wouldn't have a problem, but in those area where there's blueberries thickly scattered across flat rock, like near the craters, an astronaut might spend a lot of time flat on his butt. I have not seen anything about how sturdy a blueberry is, or whether stepping on one sitting on rock would roll it or crush it.