It has been 50 years since archaeologists discovered Lucy, perhaps the most famous ancient hominin ever found. But the ...

Voyager 2's 1986 flyby of Uranus, the main source of our knowledge of the icy planet, could have come at the same time as a ...

Artemis 2 was initially slotted for a December 2024 liftoff, but that schedule was delayed in January 2024. NASA said several ...