If supernovas Fifa 14 Ultimate Team Coins occurred randomly throughout the Milky Way, Earthcould expect one every 5 billion years. But because they congregatenear the Milky Way's spiral arms, we would in fact expect to comewithin 10 parsecs of a supernova nearly every time we pass througha spiral arm, which is about every 100 million years, Thompsonsaid.
These stellar fireworks produce x-rays, cosmic rays --electrons, protons and nuclei zooming through space at nearly thespeed of light, and gamma rays -- light waves so powerful they'recapable of killing cells.
A supernova's radiation would destroy the ozone in theatmosphere, increasing the amount of ultraviolet light that getsthrough. The UV flash could increase skin cancer rates; set offmass die-offs of bacteria and plankton; and precipitate another iceage, Thompson said.