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heliopause

heliopause

1 9.9
The outer edge of the Sun's reach where the solar wind stops
  • noun
  • /ˈhiːliəˌpɔːz/
  • Specialized
translation icon : heliopausa
  • The heliopause marks the boundary where the solar wind from the sun is halted by interstellar space.

Examples

  • For now, it's clear that Voyager 1 is within a region called the heliosheath, a transition area between the point where the solar wind slows down and the very edge of the bubble blown by the sun, called the heliopause.

    Blog text (18)
  • "That means we're close to the heliopause."

    Blog text (18)
  • How will you know when you have crossed the heliopause and are heading into interstellar space?

    Blog text (1)
  • This is the termination shock in yellow, the bow shock in the pink, and then the heliopause in orange.

  • I expect a slowing in the observed particle speeds and changes in their directions once we reach the heliopause.

    Blog text (1)
  • Scientists study the heliopause to understand how solar and interstellar winds interact in our galaxy.

  • When Voyager 1 crossed the heliopause, it provided new data about the transition into interstellar medium.

How Far

interstellar space
  • Specialized
4 6.0
heliopause
  • Specialized
1 9.9
heliosphere
  • Specialized
2 9.9
solar wind
  • Specialized
14 5.4
corona
  • Specialized
9 8.3
Sun
1.0

Surface Forms

heliopause singular
heliopauses plural

Morphology

heliopause = helio + pause (semi-transparent) = helio + pause

The parts literally mean 'sun' + 'stop', but 'helio-' is a specialized combining form and the compound is a technical scientific term, so the meaning is only partly obvious to average learners.

Etymology

Heliopause comes from the Greek root helio- meaning 'sun' and the part -pause meaning 'stop'. So, think of it as the place where the sun's wind 'pauses' and is stopped by the space beyond our solar system.