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Everyone knows how expensive it is to get mass out of a planetary gravity well. I think a lot of people forget that it would also be very expensive to bring mass into a planetary gravity well. Oh sure, we can bring stuff down fast and hot pretty easily - but we are also then adding undesireable polutants into the atmosphere - top to bottom; and we also have a fair idea what happens when objects stop fast (hit the earth) at the bottom.

With the exception of very rare or very light resources, the best current use of asteroid mining is to manufacture goods in space that stay in space.