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The solar system’s edge

in general

“Cynics—as well as most astronomers, cosmologists and, indeed NASA itself—point out that the edge of the solar system is more properly defined as the point beyond which an object will not succumb to the sun’s gravity. Gravity is, after all, what defines the universe at the grandest scale. That, though, is roughly 50,000 times farther from the sun than Earth is. Voyager 1 has so far travelled 123 times Earth’s distance from the sun, or 18 billion km. It would need another 14,000 years, give or take, to escape the sun’s gravitational pull at its current speed.”[1]

  1. Postcards from the edge, The Economist, 07-Feb-2013. 

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