For nearly 10 million Watch Duty users the free application’s alert — a gentle hum followed by an echoing — is both a frightening and comforting sound. It’s frightening because the sound alerts users ...

The atmospheric river storm hitting Northern California is set to bring heavy rain to the San Francisco Bay Area on Tuesday, potentially triggering flooding. In the mountains, the National Weather ...

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons on the lunar far side.