A study says up to 1 billion tons of water may exist near the Moon’s poles, but that would be insufficient to sustain a large lunar city over the long term. Assuming 500 tons per person a year for living and farming, a city of 1 million people would run out of water in about two years without recycling. Even with a 98 percent recycling rate, water would be depleted in about 100 years.

The European Space Agency has released a video made with Pokemon showing an “astronaut Pikachu” introducing the inside of the International Space Station. The video, posted on ESA’s official YouTube channel for World Space Week on Oct. 4-10, features a specially made Pikachu plush taken to the ISS by ESA astronaut Sophie Adenot. The plush stayed in space for 67 days, from April 11 to June 17, orbiting Earth about 1,040 times.