What do a.m. and p.m. stand for?


[hee-lee-uh-sfeer] /ˈhi li əˌsfɪər/
noun, Astronomy
the region around the sun over which the effect of the solar wind extends.
Origin of heliosphere
1970-75; helio- + -sphere Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for heliosphere
  • 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.
British Dictionary definitions for heliosphere


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
Cite This Source
heliosphere in Science
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

Word of the Day

Difficulty index for heliosphere

Few English speakers likely know this word

Word Value for heliosphere

Scrabble Words With Friends

Nearby words for heliosphere