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heliosphere

[ hee-lee-uh-sfeer ]
/ ˈhi li əˌsfɪər /
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noun Astronomy.
the region around the sun over which the effect of the solar wind extends.
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Origin of heliosphere

First recorded in 1970–75; helio- + -sphere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use heliosphere in a sentence

British Dictionary definitions for heliosphere

heliosphere
/ (ˈhiːlɪəʊˌsfɪə) /

noun
the region around the sun outside of which the sun's influence is negligible and interstellar space begins
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for heliosphere

heliosphere
[ hēlē-ə-sfîr′ ]

The large, roughly elliptical region of space around the Sun through which the solar wind extends and through which the Sun exerts a magnetic influence. The heliosphere extends well beyond the orbits of the planets, and its shape and extent fluctuate with changes to the solar wind and other influences.♦ The boundary between the heliosphere and interstellar space is known as the heliopause.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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