Many people don’t get enough vitamin D in their food. They still get enough vitamin D, because ultraviolet radiation radiation creates it—usually.
Astronomers have spotted a Neptune-sized planet with a rather unexpected feature—a comet-like tail that trails for millions of miles. Nothing quite like it has ever been seen before.
There's a reason that certain wavelengths are known as "visible" light, because those are the wavelengths that humans and most animals even remotely like us can see. But one mammal can see in ultraviolet light...and it's all because of snow.
Between their pincers and poisonous stingers, you'd really think that scorpions are already more than scary enough for one species. But that still leaves their unearthly - and unexplained - ability to glow a strange blue color in ultraviolet light.
Some of the universe's oldest galaxies appear to be going through the cosmic equivalent of a mid-life crisis, surrounding themselves with immense ultraviolet halos. These highly energetic rings of light make galaxies look young again, and astronomers are totally baffled.