Future of Earth the ozone layer that protects the surface from ultraviolet (UV) radiation from the Sun. An increase in UV-B radiation of only 10–30% is sufficient to cause a significant impact to life; particularly to the phytoplankton that form the base of the oceanic food chain. A supernova explosion at a distance of 26 light years will reduce the ozone column density by half. On average, a supernova explosion occurs within 32 light years once every few hundred million years, resulting in a depletion of the ozone layer lasting several centuries. Over the next two billion years, there will be about 20
Captain Video: Master of the Stratosphere group of crime-fighters known as the Video Rangers. He faces an interplanetary menace, as the evil dictator of the planet Atoma, Vultura (Gene Roth) and his lackey, the traitorous earth scientist Dr. Tobor (George Eldredge) are planning to conquer the earth. "Captain Video: Master of the Stratosphere" was the only serial adapted from television. It was one of Katzman's first forays into science fiction and was soon followed by "The Lost Planet. As produced by Sam Katzman, the serial had a production budget much larger than the famously small budget of the DuMont Television Network's live daily teleseries. The "Captain