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Definition of "heliopause" [heliopause]

  • The area in which the outgoing solar wind and the incoming plasma from interstellar space meet. It is the boundary of our solar system. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "heliopause" in a sentence
  • "This border, called the heliopause, is a bubble-shaped boundary surrounding our solar system where the solar wind’s strength is no longer great enough to push back the wind of other stars."
  • "The boundary where the pressure from the solar wind and the interstellar medium are at the same pressure, 16 billion kilometres from Earth, forms a giant bubble called the heliopause, and it's nothing like what scientists predicted it to be."
  • "It involves the magnetohydrodynamics of the interstellar medium and the region of the heliopause, which is much smaller."