Video: Soyuz MS-01 leaves the space station for landing

NASA Administrator Jim Bridenstine said this week the space agency is not unduly delaying the debut of new SpaceX and Boeing commercial crew capsules as engineers gear up for a challenging rapid-fire sequence of test flights in the next few months, all against the backdrop of in-depth safety reviews before clearing the privately-owned ships to carry astronauts.

Two NASA astronauts, a Japanese flier and a Russian cosmonaut plunged back to Earth Saturday, safely splashing down in the Pacific Ocean near San Diego to wrap up a five-month mission.

The three astronauts and cosmonaut are scheduled to undock from the space station at 5:05 p.m. EST (2205 UTC) on Wednesday, Jan. 14, and splashdown off the coast of California at 3:41 a.m. EST (0841 UTC).