A 1,000-foot mega-tsunami could strike the U.S. West Coast — and experts say it’s not a matter of if, but when. A new study ...

It was a very early morning in August when an entire mountainside in Alaska’s Tracy Arm fjord detached and slid into the deep ocean water beneath it.

It’s been more than 18 months since NASA narrowed to three the field of competitors vying to build the nation’s next moon ...