NASA is gearing up to launch a new crew to the International Space Station (ISS). The upcoming Crew-12 consists of NASA astronauts Jessica Meir and Jack Hathaway, European Space Agency astronaut Sophie Adenot and Russian cosmonaut Andrey Fedyaev.

The next NASA crew rotation to the International Space Station could launch as early as the morning of February 11, the U.S. space agency said Wednesday.

NASA is getting ready to launch its massive, fully expendable rocket for the first crewed flight to the Moon since Apollo. The agency’s new era of spaceflight comes with a few parts from its past, specifically three rocket engines that have previously flown on space shuttle missions.

NASA has moved up the SpaceX Crew-12 launch to Feb. 11 as four astronauts prepare for a nine-month mission to the ISS following an early Crew-11 departure.

With the wet dress rehearsal, essentially a critical fueling test of the Artemis 2 Space Launch System moon rocket, now back on Feb. 2, NASA said in a statement that it can no longer target Feb. 6 or Feb. 7, the first two days of its launch window. The Artemis 2 launch window originally ran from Feb. 6 to Feb. 10.

Before NASA can decide a rocket launch date for Artemis 2, the giant SLS rocket has to ace a critical fueling test known as a wet dress rehearsal.

ABC News’ Elizabeth Schulze spoke with two former NASA scientists who say they are concerned about a potential safety issue with the Artemis II spacecraft ahead of its highly-anticipated launch.

Four astronauts are scheduled to launch on a trip to fly around the Moon as early as Feb. 6 in the Orion spacecraft.