In space, gravitational lensing occurs when the energy in a massive celestial body like a galaxy cluster creates enough of a curve in spacetime for the path of light around it to appear bent as if by ...

Einstein predicted the existence of gravitationally-warped rings of light in 1915. Now, a new one has been discovered just a cosmic stone's throw from our own planet. When you purchase through links ...

This involves a nearby galaxy aligned with another more distant one, causing one of nature's most spectacular phenomena: a gravitational lens. The largest lenses in the world are not built by humans.

China has quietly solved a problem that only becomes obvious once you try to live and work off-world: clocks on the moon do ...