PredictionBook transitioning to read-only mode at the end of 2023 ( read more ).

“By 2020 a completely propellantless (no material particles expelled for propulsion) or “field propulsion-type” aerospace vehicle will land on the Moon.”

Created by gwern on 2010-07-30; known on 2020-01-01; judged wrong by Bruno Parga on 2019-12-31.

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