If you'd been able to stare at Earth from space during the late Cretaceous, when Tyrannosaurus rex and Triceratops roamed, it would've looked like the whole planet had tipped over on its side. According to a new study, Earth tilted by 12 degrees about 84 million years ago.... The researchers found that, between 86 and 79 million years ago, the crust and mantle had rotated around Earth's outer core and back again — causing the entire planet to tilt and then right itself like a roly-poly toy.... ...Prior to the late Cretaceous, the Pacific Plate — the largest tectonic plate...