Instead of remaining at the International Space Station (ISS) for the full duration of their mission, the four crew members are coming home a month early due to a medical issue with one of the astronauts.

A Falcon 9 rocket carrying about 40 payloads, including NASA's Pandora exoplanet satellite, is scheduled to lift off from California's Vandenberg Space Force Base during a 57-minute window that opens at 8:19 a.m. EST (1319 GMT and 5:19 a.m. local California time).

The four crew of NASA astronauts Zena Cardman, commander, and Mike Fincke, pilot, along with JAXA astronaut Kimiya Yui and Roscosmos cosmonaut Oleg Platonov, both mission specialists, are cutting