Optical films, thin layers predominantly used for applications such as antireflection coatings for camera lenses and cold ...

Ultraviolet (UV) radiation is a type of light. Sunlight has UV rays, along with other kinds of rays. Some light bulbs give off UV rays, too. UV light bulbs are used in tanning beds and lamps, some ...

One hundred years ago, Alexander Gurwitsch dared to propose that living cells emit faint ultraviolet light, invisible to the naked eye, to communicate with and stimulate one another. It was an ...

The astronomers believe this is the case for HD 65907. What makes this star especially unique is that it's not a member of a cluster, where frequent mergers can easily lead to blue stragglers.