Terrawatch: Asteroid that wiped out dinosaurs triggered global mega-tsunami

Jumble of rocks in far-flung locations help researchers work out how big and how far-reaching impact would have been

Any dinosaur that survived the Chicxulub asteroid impact 66m years ago then faced a mega-tsunami that washed around the entire world and began as a mile-high wave, a study shows.

It is no surprise that a 14km-wide asteroid slamming into the Gulf of Mexico would generate one hell of a tsunami but this is the first time anyone has worked out how big and how far-reaching it would have been.