If there is life on other planets, they will be the first to know about it. The American Space Agency in Pasadena is the place where rovers exploring the surface of Mars, robots and unmanned ships are created. At the NASA Jet Propulsion Laboratory, Artur Chmielewski, an engineer of Polish origin, will tell Marcin why working on the construction of a spacecraft is extremely tiring and what the procedures related to this process look like. It was from this place that the sending of the Curiosity rover to Mars in 2012 and the Perseverance rover in 2020 were supervised. Marcin will check where robots sent into space are tested and why each rover has its own "twin brother".