NASA's SpaceX Crew-11 flight is more than just a crew rotation — it lands during a historic moment in spaceflight: the 25th anniversary of uninterrupted human habitation aboard the ISS.

The next four people to launch to the International Space Station have arrived at their launch site.

Two NASA satellites rocketed into orbit from California aboard a SpaceX Falcon 9 rocket Wednesday, commencing a $170 million mission to study a phenomenon of space physics that has eluded researchers since the dawn of the Space Age.