On August 17th, both the light and the gravitational wave signals from inspiraling-and-merging neutron stars reached Earth, where both were detected, for the first time, by humans. The inspiral phase ...

The UV index measures the intensity of skin-damaging ultraviolet radiation at the Earth's surface. The UV index ranges from 0 to 11-plus, with higher values indicating greater risk of sunburn and skin ...

Researchers successfully conducted a room-temperature continuous-wave lasing of a deep-ultraviolet laser diode (wavelengths down to the UV-C region). A research group led by 2014 Nobel laureate ...

Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. However, too much exposure to UV radiation is damaging ...