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The roughly spherical volume of space, centered on the sun and extending into the Kuiper belt, that is composed of particles emitted from the sun and forms a bubble that displaces the interstellar medium.


(Astronomy) the region around the sun outside of which the sun's influence is negligible and interstellar space begins


(ˈhi li əˌsfɪər)

the region around the sun over which the effect of the solar wind extends.


The area of space occupied by the Sun’s magnetic field and gases.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.heliosphere - the region inside the heliopause containing the sun and solar system
region, part - the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
Milky Way, Milky Way Galaxy, Milky Way System - the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky
solar system - the sun with the celestial bodies that revolve around it in its gravitational field
References in periodicals archive ?
The first scene of the imaginary movie might focus on the hydrogen wall, a region about 100 astronomical units from the sun (100 times the distance between the sun and Earth), where the solar wind peters out and the interstellar gas begins.
Researchers had previously inferred the presence of a hydrogen wall around the sun.
Equipped with ultraviolet spectrometers and radio-wave detectors, these craft may help pinpoint the exact location of the hydrogen wall and detect interstellar gas as it enters the solar system.