Don't Get Your Hopes Up for a City on the Moon

• The article discusses the feasibility of building a city on the Moon, highlighting the lack of practicality due to resource constraints.
• The authors argue that while the Moon has significant water ice, the amount is not sufficient to sustain a large population, and the energy required to extract and recycle it is a major challenge.
• The study concludes that a city of one million people would deplete a billion tons of water in just 2.4 years, but with advanced water recycling, this could be extended to 100 years.
• The authors emphasize that current water recycling efficiency on the International Space Station (ISS) is 94%, and improving it to 98% would significantly increase the time frame for water exhaustion.
• The research underscores the need for accurate measurements of lunar water ice and the development of efficient recycling systems to make lunar settlements viable.

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