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But none of the new data give clues to the positrons’ source, cheap jordans for sale , said Katherine Freese, a theoretical astrophysicist at the University of Michigan in Ann Arbor. The trajectories of these charged particles can change as they move through magnetic fields, she said, cheap real jordans , making it difficult to determine where the particles began their journey. Her bet is that rapidly spinning stars called pulsars produce positrons and fling them across the galaxy using extremely strong magnetic fields. “It will take a while to sort this out,” she said. In the mid-1990s, cheap jordans free shipping , physicists got a first peek at cosmic rays that could have resulted from dark matter annihilation. The High Energy Antimatter Telescope, a cosmic ray detector attached to a high-altitude balloon, http://cheapjordansstock.com , found an unexpectedly high number of positrons, a result that seemed to jibe with the idea that dark matter annihilation creates these charged particles. In the last five years two space-based detectors, cheap wholesale jordans , PAMELA, for the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics, cheap Authentic jordans , and the Fermi Gamma-ray Space Telescope, have found even more decisive evidence of excess positrons. Unfortunately for dark matter hunters, the specifics of the probes’ observations do not match up well with theories that predict cosmic rays resulting from dark matter annihilation. Along with electrons and positrons, cheap jordans online , dark matter annihilation should produce other signals like extra antiprotons (protons’ antimatter siblings), gamma rays and radio waves. But detectors have found no evidence of any of those signals. Researchers hope that AMS can bring clarity to this debate because of its leg up on other cosmic ray detectors. Among other strengths, its perch aboard the International Space Station means it can sample the full spectrum of cosmic rays above Earth’s atmosphere, avoiding molecules in the air that prevent most cosmic rays from ever reaching the ground. AMS also sports a strong magnet and precise sensors that allow researchers to easily distinguish between particles that behave similarly, cheap air jordans , such as protons and positrons. http://www.midwestartfairs.com/node/add/article http://airesearch.com/...43855.msg244072#msg244072 http://www.nvstripercl...872.msg2254188#msg2254188 |