Thanks to Einstein’s relativity, time flows differently on Mars than on Earth. NIST scientists have now nailed down the difference, showing that Mars clocks tick slightly faster—and fluctuate over the Martian year. These microsecond shifts could play a ...

A group of four NASA astronauts are set to blast off on a historic mission, dubbed Artemis II, as soon as February 6 MARTIN LELIEVRE/AFP via Getty; CHANDAN KHANNA/AFP via Getty Astronauts could be just a week away from returning to the moon Four ...

The four Artemis II astronauts, returning from ⁠the ⁠world's first crewed moon voyage in over half a ⁠century, hurtled back toward Earth on Friday aboard their gumdrop-shaped Orion spacecraft, headed for a splashdown in the Pacific Ocean off ​Southern California.

Tonight, the Artemis astronauts on board their Orion spacecraft are speeding towards Earth for their dangerous re-entry and splash landing. NBC News’ Tom Costello has more on their final preps and the timeline for Orion’s return.

The astronauts aboard the Artemis II mission are called a crew, but they really regard themselves as a team, right down to how they move around the Orion spacecraft's cabin. They've been intently focused on the overall success of the Artemis program,