Science Fair Project Encyclopedia In astronomy, the termination
shock is theorised to be a boundary marking one of the outer
limits of the sun's influence. It is where the bubble of solar
wind particles slows down to below supersonic speed and heats up
due to collisions with the galactic interstellar medium. It is
believed to be about 100 Astronomical Units from the Sun. The
termination shock boundary fluctuates in its distance from the
sun as a result of fluctuations in solar flare activity i.e.
changes in the ejections of gas and dust from the sun. The
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