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Many technical challenges remain before people can be put on the lunar surface — a goal currently slated for 2027. On the way to Mars, astronauts would face extreme isolation and higher doses of deadly space radiation over longer periods than they have ever been exposed to on the Moon or on space stations.
Their inclusion appears to be the result of a political compromise with Member States rather than of scientific appraisal as in the case of nuclear energy. Having an expiration date creates political investment uncertainty and risk, which is precisely what the Taxonomy intended to remove. This makes the condition impractical.
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