On November 2, 2000, astronaut Bill Shepherd and cosmonauts Yuri Gidzenko and Sergei Krikalev entered the International Space Station (ISS). That means that for the last 25 years, there have always been some humans in space – a quarter of a century in which a few members of our species have not been on the planet where we have all come from. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The ISS has been revolutionary. Over 250 people from 26 countries have visited the ISS, conducting several thousand scientific investigations on behalf of researchers from over 100 countries. There are hundreds of experiments going on every day. Their scope spreads from medicine to fundamental physics.

It had been true to its name of being internat

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