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
Zombies of the Stratosphere Zombies of the Stratosphere Zombies of the Stratosphere is a 1952 black-and-white Republic Studios serial directed by Fred C. Brannon, with a screenplay by Ronald Davidson, and special effects by Republic's Lydecker brothers. This was intended to be Republic's second serial featuring "new hero" Commando Cody and the third 12-chapter serial featuring the rocket-powered flying jacket and helmet introduced in "King of the Rocket Men" (1949). Instead, for reasons unknown, the hero was renamed "Larry Martin", who must prevent Martian invaders from using a hydrogen bomb to blow Earth out of its orbit, so that the Martians can move a