
1) Bound 2) Boundary 3) Bounds 4) British musical trio
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https://www.crosswordclues.com/clue/heliopause

The point at which the solar wind meets the interstellar medium or solar wind from other stars.
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http://planetfacts.org/space-terms/

The boundary theorized to be roughly circular or teardrop-shaped, marking the edge of the Sun's influence, perhaps 100 AU from the Sun.
Found on
http://www.braeunig.us/space/glossary.htm

boundary of the heliosphere, the teardrop-shaped region around the Sun that is filled with solar magnetic fields and the outward-moving solar wind ... [1 related articles]
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http://www.britannica.com/eb/a-z/h/33

The boundary of the heliosphere, where the pressure at the outer part of the heliosphere equals that of the surrounding interstellar medium (ISM). It is believed to lie between 100 and 150 astronomical units (AU) from the Sun in the direction in which the Sun is moving, but much further out downstre...
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http://www.daviddarling.info/encyclopedia/H/heliopause.html

The boundary theorized to be roughly circular or teardrop-shaped, marking the edge of the sun's influence, perhaps 100 AU from the sun.
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http://www.encyclo.co.uk/visitor-contributions.php

The point in space at which the solar wind meets the interstellar medium or solar wind from other stars.
Found on
http://www.seasky.org/astronomy/astronomy-glossary.html

The point at which the solar wind meets the interstellar medium or solar wind from other stars.
Found on
http://www.solarviews.com/eng/terms.htm

[
n] - the boundary marking the edge of the sun`s influence
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http://www.webdictionary.co.uk/definition.php?query=heliopause

heliopause The outer boundary of the heliosphere, where the solar (or interplanetary) magnetic environment gives way to the interstellar.
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http://www.wordinfo.info/words/index/info/view_unit/963/3

The boundary between the solar wind and the interstellar wind, where the pressure of both are in balance. See also: Bow Shock, Heliosheath, Solar System, Termination Shock.
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https://www.encyclo.co.uk/local/20687
noun the boundary marking the edge of the sun`s influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind and the wind from other stars meet
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.