When a massive star dies, astronomers expect a familiar chemical script: hydrogen and helium on the outside, heavier elements buried deep within. The latest observations of a stellar explosion known ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. KYIV, Ukraine (AP) — A drone armed with a ...

Transitioning away from per- and polyfluoroalkyl substances (PFAS), which offer water- and oil-repelling properties on the outer shells of firefighter turnout gear, could bring potential performance ...