helio-sphere

heliosphere

[hee-lee-uh-sfeer]
noun Astronomy.
the region around the sun over which the effect of the solar wind extends.

Origin:
1970–75; helio- + -sphere

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To helio-sphere
Collins
World English Dictionary
heliosphere (ˈhiːlɪəʊˌsfɪə)
 
n
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
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature