| http://www.w3.org/ns/prov#value | - and forth across a desolate world.Some even more primitive robots have, in less than 30 years, been shot out into the inky blackness which surrounds us, and other planets are photographed -- planets that are thick with heat and pressure, enormous swirling clouds of gas and storms that bring acids and liquid metals in a hazy sheet across a surface whose contents I can barely imagine or conceive.
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