Add Yahoo as a preferred source to see more of our stories on Google. After their historic trip around the moon, the Artemis II astronauts were greeted by a blow-up alien on board the Navy ship John P ...

Former NASA astronaut Mike Massimino, known for his work on the Hubble Space Telescope and who flew on two space missions, has weighed in on one of humanity's biggest questions: Are we alone in the ...

In 1965, twelve astronauts vanished into deep space on a mission Earth never acknowledged—sent to live among aliens on a planet called Serpo. What they found was a world of impossible tech, but not ...