Wild swing that led to the sun dips on Earth.

<P Align=center> </ P> <P align=left> solar system, the path of a roller coaster around the galaxy itself periodically to deadly radiation in interplanetary space by the attacks. .(Photo courtesy: Adrian Melott / University of Kansas) </ P> World Scientific reports [tech.] News: Researchers may have found the mysterious planet's biodiversity periodic dips reasons. .They found that the sun orbits around the galactic center operation there is a roller coaster-like swings, so that the Earth periodically deadly interstellar cosmic rays near the source. .<P Align=left> in the past 5 billion years, the total number of species on the planet will tend to occur every 6200 years a regular dip. .This phenomenon occurred in the last 55 million years ago, that led to extinction of the KT mass extinction of dinosaurs occurred about 1000 years after the loss of biodiversity at the time by about 10%; and occurs in 115 million years ago, a large biological .also caused a similar number of extinct species disappear. .So far, evolutionary biologists can determine, this phenomenon seems to be cyclical extinction cycle, but has been unable to find out the reason behind it. .</ P> <P align=left> Now, University of Kansas, Lawrence United States, researchers believe they may have found the answer. .Physicists involved in the study, said Adrian Melott, a paper published in 2005 attracted his attention, this paper calculated that biodiversity loss is always that regularly occur in the time thousands of years as a .time scale, which made him begin to doubt, may be a galaxy of factors led to all this, because for any place in the inner solar system in terms of cyclical events, this time a bit too long. .</ P> <P align=left> So he and Kansas colleague Mikhail Medvedev began to study the possibility of this assumption. .The researchers noted that, in the planet's biodiversity is declining, just run to its orbit the sun relative to the highest point of the galactic plane, where most of the Milky Way stars gathered. .</ P> <P align=left> researchers reported that the galaxies near the Milky Way magnetic field and radiation generated by the interaction between the formation of a potentially lethal cosmic-ray source, at which point the location of the solar system and its distance from .the most recent. .Researchers in the August 1 issue of "Astrophysical Journal" published the findings. .</ P> <P align=left> these galaxies in the direction of the constellation Virgo, which included the release of radiation there is a particle called the μ meson. .μ meson powerful - the ability to penetrate the 2.5-km deep water or 900 meters of rock, enough to affect all life on Earth, while damage to their DNA (DNA). .Melott said that the apex of the sun and swing in the fossil record time of mass extinctions perfectly matched, so "we will raise this incredible conclusion." .</ P> <P align=left> California, Lawrence Berkeley Lab physicist Richard Muller of the assumption that this paper "is full of charm", is likely to lead to astrophysics and evolutionary biology community's "great concern .. " .Muller was in England in 2005 "Nature" magazine published that paper inspired Melott inspiration. .But the question is, Muller deadly cosmic rays that cause the planet's biodiversity may not be the direct cause of decline. .There may be other "candidates", eg the large climate change. .He said: "We are trying to have a better understanding of the mechanism." </ P> </ p>.