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SLATE Slate is a low grade metamorphic rock with a fine grain. Slate often has a gray color and may be split into parallel layers. The precursor rock is generally a shale or siltstone. Slate is used as roofing, as the flat beds of billiard tables, and historically had many other uses since replaced (such as school blackboards). |
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See Steve's video interview about asteroid capture at Moonandback: Part 1 Part 2 Part 3 |
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See Steve's blog Ramblings On The Future Of Humanity (recent post) A Project Plan for Space Based Solar Power
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