Word: surfacesâ
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...devices that accelerate subatomic particles in a vacuum. For the same reason, electron beam-welding?which also requires a high vacuum?would be facilitated on the moon. Another joining process, cold-welding, could become an important part of lunar industry. In a vacuum, two perfectly clean and smooth metal surfaces???uncontaminated by oxides that are formed in the earth's atmosphere ?can be welded solidly together without heat and with little pressure...
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