space-time

After 16 months of testing technologies that can detect the ripples in space-time known as gravitational waves, the LISA Pathfinder spacecraft shut down on Tuesday (July 18).

A massive cosmic object can act like a lens, magnifying and warping the images of background bodies. Learn all about this "gravitational lensing" phenomenon in the third episode of "We Don't Planet."

The LIGO experiment, which made the first direct detection of gravitational waves, is once again on the hunt for these ripples in the fabric of space-time.

Researchers have tested optical clock technology in space for the first time, showing that the extremely precise technology could find a use in space-based applications.