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heliopause |
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heliopauseBoundary between the heliosphere—the teardrop-shaped region around the Sun created by the solar wind and filled with solar magnetic fields and outward-moving gas—and the zone of transition to the interstellar medium. Its tail is estimated to reach 110–170 astronomical units from the Sun, encompassing the orbits of all the major planets. Its shape changes, influenced by a wind of interstellar gas produced by the Sun's motion through it. |
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We're in a race to see if we can get through the heliopause and truly into interstellar space while the craft still have the electrical power to observe what's out there. Guided by strong bursts of radio waves that Voyager 1 has detected since November 2002, scientists now calculate that the edge, known as the heliopause, resides between 153 and 158 times as far as Earth does from the sun. Scientists calculate that by 2010, the venerable Voyager 1 and Voyager 2 craft, now more distant than Pluto and speeding rapidly toward the edge of the solar system, will cross the heliopause. |
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heliopause