In 1919, a total solar eclipse offered the only chance to test Albert Einstein's radical new theory of gravity, General ...

Confirmed by an eclipse, Einstein's theory of gravity revealed a spectacular tool: gravitational lensing. This video explains how massive galaxies warp spacetime to act as natural cosmic telescopes, ...

Before Einstein, before Bohr, there was a Jesuit priest with a telescope and a startlingly modern vision of the universe.

FROSTI is a new adaptive optics system that precisely corrects distortions in LIGO’s mirrors caused by extreme laser power.

Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet's intricate timekeeping system, ...

For close to a century, scientists have been trying to marry Albert Einstein’s General Theory of Relativity and quantum ...

BEIJING -- In the course of almost two years after China's astronomical satellite named Einstein Probe was launched, it has ...

Stars powered by dark matter instead of nuclear fusion could solve several mysteries of the early universe, and we may have ...

Vatican Observatory scientists Fr. Gionti and Fr. Galaverni reveal new insights into General Relativity, showing Jordan and ...

The universe occasionally produces a huge surprise that proves physicists wrong, says Kip Thorne, who grew up in Logan, Utah, ...