Fram2 will send four people from four different nations to low Earth orbit for three to five days. Those crewmembers — all of them spaceflight rookies — are mission commander Chun Wang of Malta, vehicle commander Jannicke Mikkelsen of Norway, pilot Rabea Rogge of Germany, and Australian Eric Phillips, Fram2's medical officer and mission specialist.

A four-person crew will spend three to five days aboard a SpaceX capsule orbiting above the poles of Earth — a flight path never flown before.

SpaceX's Fram2 astronaut mission is set to launch toward a polar orbit on March 31, which will be a first for human spaceflight. Why has this never been done before?