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
S-1 (satellite) 4". "S-1" was the first geocentric orbit launch attempt for the rocket; its second attempt on August 14, 1959, carrying the "Beacon 2" inflatable sphere experiment to low Earth orbit, also failed. Eventually, both the Juno II and a re-launch of the "S-1" mission, designated "Explorer 7" or "S-1A", found success on October 13, 1959. The satellite, which ended its mission in August 1961, is still orbiting the Earth today. S-1 (satellite) S-1, also known as Explorer S-1 and Explorer 7X, was a geoscience satellite equipped with a suite of scientific instruments to study the environment around the Earth. The