42 is the answer

Expedition 42 crewmembers, from left: Russian cosmonaut Elena Serova, NASA commander Barry Wilmore, cosmonauts Alexander Samoukutyaev, Anton Shkaplerov, NASA astronaut Terry Virts and ESA astronaut Samantha Cristoforetti.

Alexander, Elena and Barry left Earth on 25 September from Baikonur cosmodrome in Kazakhstan, the other trio will follow on 23 November.

Each three-person crew will spend around six months on the International Space Station. Samantha’s mission is named Futura after a competition was run in her home country, Italy.

Follow Samantha via samanthacristoforetti.esa.int