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Thread: What holds the Heliosphere together?

  1. #1 What holds the Heliosphere together? 
    Forum Cosmic Wizard
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    The Heliosphere is the Sun's astrosphere. (not my choice of words, blame NASA)

    The Solar system appaently travels through space like a comet with a tail. it has a boundary called the shock.
    What makes this boundary between the solar system and the rest of the universe?


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  3. #2  
    Forum Professor astromark's Avatar
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    If I understand you.. I would offer the 'Solar Wind'.
    A constant outpouring of electromagnetic energies and particles. Is held in a suspension of escape velocity and gravity.


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  4. #3  
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    From Wikipedia
    Heliosphere - Wikipedia, the free encyclopedia
    The shock arises because solar wind particles are emitted from the Sun at about 400 km/s, while the speed of sound (in the interstellar medium) is about 100 km/s. (The exact speed depends on the density, which fluctuates considerably.) The interstellar medium, although very low in density, nonetheless has a constant pressure associated with it; the pressure from the solar wind decreases with the square of the distance from the Sun. As one moves far enough away from the Sun, the pressure from the interstellar medium becomes sufficient to slow the solar wind down to below its speed of sound; this causes a shock wave.
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  5. #4  
    Forum Cosmic Wizard
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    So the speed of sound in space is what holds the heliosphere together. Great.
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  6. #5  
    AI's Have More Fun Bad Robot's Avatar
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    I found a few pictures that might help you visualize the subject of this topic.







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  7. #6  
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    The simple answer is gravity.
    Meteorologist/Naturalist & Retired Soldier
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