Heliosphere

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System.

    "The heliosphere isn’t really a sphere at all, more an elongated teardrop shape."

  2. 2
    the region inside the heliopause containing the sun and solar system wordnet

Synonyms

All synonyms
bow shockheliopauseheliosheathinner heliospherenearspacesolar magnetosphere

Example

More examples

"Scientists define the beginning of interstellar space as the place where the sun’s constant flow of material and magnetic field stop affecting its surroundings. This place is called the heliopause. It marks the end of a region created by our sun that is called the heliosphere."

Etymology

From helio- + -sphere.

Related phrases

inner heliosphereouter heliosphereinterstellar mediumsolar systemsolar windstellar magnetospherestellar wind

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