When I say jump, your iPhone can tell you how high.

The European Space Agency’s ACES mission could ultimately pave the way for a global network of atomic clocks that make these measurements far more accurate. In 2003, engineers from Germany and ...

For more than a decade, survey flights have crisscrossed the United States using gravity instruments to calculate a new sea level in an effort that will save the country billions of dollars on ...

Called the Ice, Cloud and Land Elevation Satellite-2 (ICESat-2), the mission is currently scheduled to launch in mid-September. ICESat-2 will measure elevation changes on Earth, one laser pulse at a ...