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

1970–75; helio- + -sphere

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To heliosphere
World English Dictionary
heliosphere (ˈhiːlɪəʊˌsfɪə)
the region around the sun outside of which the sun's influence is negligible and interstellar space begins

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
heliosphere   (hē'lē-ə-sfîr')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Example sentences
The sun has a magnetic field, the heliosphere, which envelops our entire solar system.
The heliosphere is a bubble that surrounds our entire solar system and is inflated.
The system travels within a bubble of solar wind-made of charged particles from the sun-called the heliosphere.
Particles streaming from the sun create solar winds, which form a bubble around the solar system dubbed the heliosphere.
Related Words
Images for heliosphere
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature