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.

NASA will launch two crewed missions in early February, sending astronauts to the ISS to prepare for Mars missions and another crew to orbit the moon.

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.

Safety matters when four astronauts' lives are at stake.

NASA returned Crew-11 early after a medical issue onboard the ISS. Here's the latest, as the astronauts returned to Houston.

NASA's space shuttle Challenger completed 10 missions before it broke apart during a launch in 1986, killing seven astronauts.