Keyword Ultraviolet Light

The citizens of Comet Valley are being taken over by seeds from an alien plant that has taken root there. A sheriff investigates the strange...

An exciting video journey through the world of time-lapse photography by one of the founders of the science of photobiology, Dr. John Nash Ott. Do...

The sun is always changing and NASA's Solar Dynamics Observatory is always watching. Launched on February 11, 2010, SDO keeps a 24-hour eye on the...