FROM an experimental point of view, Einstein's general theory of relativity is at present in an ambiguous position. It is well known that there are three conceivable tests between its conclusions and ...

According to Einstein's Theory of Gravity, a ray of light is attracted by a clump of matter. As a consequence of "gravitational lensing," the light ray changes its direction from a straight line by a ...

Astronomers utilized the Hubble Space Telescope to achieve the first measurement of gravitational light deflection caused by an extrasolar star, Stein 2051B, a white dwarf, as it passed in front of a ...

A new way to control light using liquid crystals has been developed by researchers in Japan, who believe that their method offers many of the advantages of an artificial “metasurface” while being much ...