Einstein predicted the existence of gravitationally-warped rings of light in 1915. Now, a new one has been discovered just a ...

A 'false dusk' will be visible during twilight in February, but only from locations that are free of light pollution. Here's everything you need to know about zodiacal light.

Harvard and Smithsonian (CfA), and its Submillimeter Array (SMA), were critical for identifying a cache of belts surrounding other stars beyond the sun where comets may reside. Regions around 74 stars ...