Forgive me if this has been answered previously on the list, but approximately how wide are these things? I remember finding bunches of little sandstone spheres in the vicinity of Snow Canyon when I was a teenager, perhaps around half a centimeter in diameter. It looked like these spheres would form on flat surfaces, where (my guess) the wind and elements had worn away at the sandstone, leaving harder sections of material (the spheres) resting on the surface. That guess could be way off, but I'm wondering if the Martian speheres are similar in nature/composition. Thanks for the pic, these 3-D ones make you feel like you're there. It always strikes me as amazing when I think about it that these rovers aren't just out in the desert somewhere, but on _another planet_ millions of miles away. The engineering involved to get these things into space, across millions of miles of space in working order, without getting fried or frozen and onto the planet without becoming a mass of molten goo, and eventually rolling around and doing significant geology research. It's staggering almost! (Well, to me anyways :-) Thanks again! -- Dan Hanks (now back to lurking).. On Thu, 12 Feb 2004, Patrick Wiggins wrote:
ttp://marsrovers.jpl.nasa.gov/gallery/press/opportunity/20040212a/09-ml-5-pre_post_anim-B019R1.gif
Patrick
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