NASA

Forty years after the Challenger disaster, NPR explores the engineers' last-minute efforts to stop the launch, their decades of guilt and the vital lessons that remain critical for NASA today.

The SLS rocket arrived at its launch pad Saturday. Teams are working toward a launch as early as Feb. 6.

Four people from NASA's Crew-11 mission splashed down off San Diego, successfully completing five months aboard the International Space Station. The trip was cut short due to a medical issue.

NASA is returning the crew of four early due to a medical issue with one of the astronauts. It's the first time a NASA mission has been cut short for health reasons.

NASA says a crew member on the International Space Station is unwell. The agency canceled a planned spacewalk for Thursday and is taking the rare step of ending the Crew-11 mission early.

A medical concern involving one of the crew members cancelled a planned spacewalk Thursday. Now NASA says the issue could cut the entire mission short.

The dress rehearsal for NASA's Artemis II launch will help prepare the astronauts for the real launch date, which is planned for no earlier than February.

A proposal by the FAA would include shutting down Playlinda beach for up to 60 days to accommodate the launches.

Some scientists believe that sending seeds into space could help them adapt to future climate challenges.

Once the seeds return to Earth, scientists will examine their appearance, extract DNA to study genetic changes and test their physiology.

The satellite blasted off from India on Wednesday. Scientists say the $1.3 billion mission will help forecasters and first responders stay one step ahead of floods, landslides and other disasters.

The employees who have chosen to leave the agency amount to about 20% of NASA's workforce.