Ribbon at edge of solar system explained - Space.com- msnbc.com
MSNBC reports: "A mysterious ribbon spotted on the edge of the solar system has turned out to be a reflection of particles streaming off the sun, scientists have found. [...] The sun emits a stream of charged particles called the solar wind. These particles apparently travel out to the edge of the solar system, where they encounter a strong magnetic field coming from the rest of the galaxy, that slingshots them back in the direction they came from."