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s the 28-year-old Voyagers 1 and 2 spacecraft approach the edge of interstellar space, they have found that the heliosphere, the "bubble" within which the sun dominates, bulges outward in the northern hemisphere and is pressed inward in the south. Voyager 1, flying about 34 degrees north of the equator, crossed the termination shock and entered the outermost layer of the heliosphere about 9 billion miles from the sun. Meanwhile Voyager 2, about 26 degrees south of the equator, finds that the shock may be nearly a billion miles closer to the sun.
Scientists believe that the observed discrepancies may be attributed to an interstellar magnetic field pressing inward on the southern hemisphere. Voyager 2 will determine the exact location of the shock in the south when it crosses it sometime before the end of next year. Then scientists will have a better idea of how strong the magnetic field is outside of the heliospheric bubble.
Voyager 2 is also finding that the shock in the south is a source of low energy ions as was discovered by Voyager 1 in the north. Contrary to earlier predictions, however, neither Voyager 1 nor 2 have found the source of higher energy anomalous cosmic rays.
Originally posted by jtma508
Or perhaps there is a flow of energy particles of some kind that travel north-to-south through the heliosphere.
Originally posted by Yarium
At such a distance it would almost be impossible to detect, since it would reflect very little starlight or sunlight.
Originally posted by Darkpr0
Hm... perhaps residue from the black hole at the centre of the galaxy or some other celestial body?
Originally posted by cmdrkeenkid
You can hear recordings of what these, and other celestial objects, sound like here at spacesounds.