An atom's cloud of electrons makes it difficult to determine an exact boundary for "touching," Baird said. Instead, it is ...

A silver amulet found in a 1,800-year-old grave in Germany speaks to the importance — and the risk — of being Christian in ...

If you missed the peak of the Geminid meteor shower earlier this month, don't worry — there's still another chance to catch a ...

Two cannons found at a site dating to 1541 in Arizona may be the oldest surviving firearms in the U.S. They were abandoned by the Spanish after they were defeated in battle.

Composite images reveal how the sun's corona changed from one total solar eclipse to another in 2023 and 2024, just as solar ...