On the heels of a year that brought a dazzling green comet, a rare sunrise eclipse, peak planet viewing, an interstellar ...

Thanks to Einstein’s relativity, time flows differently on Mars than on Earth. NIST scientists have now nailed down the ...

NEW YORK (AP) — The year’s first supermoon and meteor shower will sync up in January skies, but the light from one may dim ...

Earth’s rotation is slowly slowing, scientists say, meaning days are getting longer, though the change takes millions of ...