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Q&A How to extract an object from 200 miles below the surface of the planet Mercury?

In Stephen Baxter's science fiction Novel Ultima humans discover mysterious "kernels" which allow high speed space propulsion units to be built. The problem is that these kernels are only to be fo...

4 answers  ·  posted 7y ago by Slarty‭  ·  last activity 7y ago by Slarty‭

Question reality-check planets technology near-future mining future