Heliopause

//ˈhi.li.əˌpɔz// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The boundary of heliosphere where the Sun's solar wind is stopped by the interstellar medium.
  2. 2
    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 from the sun and the radiation from other stars meet wordnet

Synonyms

All synonyms
heliosheathheliospherestellar magnetospherestellar windtermination shock

Example

More examples

"The boundary of the solar cavity is the heliopause, about fifty astronomical units from the sun, where the solar wind pressure is down to the tiny pressure between stars in our arm of the galaxy."

Etymology

From helio- + -pause.

Related phrases

interstellar mediumsolar wind

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.