Scientists have discovered that a portion of the North American craton is slowly dripping into Earth's mantle, challenging ...

Etched along each of the pulsar lines are vertical and horizontal dashes ... the Voyager spacecraft left Earth. Back before laptops and cell phones and Google Maps, Frank Drake created an elegant ...

marked by the white horizontal line in the photograph," NASA officials wrote in a description of the flight. "The Earth's curvature explains this phenomenon, as described in the diagram ...