A major step toward launch day is complete as NASA's Artemis II astronauts ran through a countdown demonstration test.

Humanity has sent into space everything from lightsabers and Tesla Roadsters to golden records and entire digital genetic ...

Neil Armstrong is widely remembered as the commander of Apollo 11, the landmark NASA mission that carried humans to the Moon. On July 20, 1969, he made history as the first person to set foot on the ...

Learn how Mount Wilson Observatory was founded on Dec. 20, 1904, the people involved, and the decisions that shaped early modern astronomy ...