China just took another step toward landing astronauts on the moon, acing a key abort test with its Mengzhou crew capsule and pulling off a soft splashdown with the returning rocket.

NASA is launching a rocket mission from Alaska as early as Saturday to study and help understand electrical circuitry underlying the aurora. The rocket mission will use a technique similar to how a CT scan works on humans, to reconstruct the electrical currents flowing from the northern lights, NASA said.

NASA has run into exasperating fuel leaks in a make-or-break test of the moon rocket that's supposed to send astronauts on a lunar fly-around.

NASA is providing a 24/7 live feed of the Space Launch System rocket on the launch pad at the Kennedy Space Center in Florida.

The quartet's arrival will take the ISS back up to its normal complement of seven crewmembers. The station has been staffed by just three astronauts — one American and two Russians — since Jan. 15, when SpaceX's Crew-11 mission departed for Earth.

The rollout sets the stage for tests and dress rehearsals ahead of NASA's first crewed flight to the moon in more than 50 years. The mission could launch in three weeks.

NASA plans to test the planned leak repair with a second dress rehearsal fueling test later this month.

What time is the rocket launch? 4 crew members from 3 space agencies will launch aboard SpaceX Falcon 9 rocket, Dragon spacecraft to the space station