Solar System - Farthest Regions

Farthest Regions

The point at which the Solar System ends and interstellar space begins is not precisely defined, since its outer boundaries are shaped by two separate forces: the solar wind and the Sun's gravity. The outer limit of the solar wind's influence is roughly four times Pluto's distance from the Sun; this heliopause is considered the beginning of the interstellar medium. However, the Sun's Hill sphere, the effective range of its gravitational dominance, is believed to extend up to a thousand times farther.

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Famous quotes containing the word regions:

    It is doubtful whether anyone who has travelled widely has found anywhere in the world regions more ugly than in the human face.
    Friedrich Nietzsche (1844–1900)