heliosphere

noun

he·​li·​o·​sphere ˈhē-lē-ə-ˌsfir How to pronounce heliosphere (audio) -ō- How to pronounce heliosphere (audio)
: the region in space influenced by the sun or solar wind
heliospheric
ˌhē-lē-ə-ˈsfir-ik How to pronounce heliosphere (audio)
-ˈsfer-
-lē-ō-
adjective

Example Sentences

Recent Examples on the Web Moving at hypersonic speeds, the wind blows out from the sun like an inflating balloon, forming what astronomers call the heliosphere. Tim Folger, Scientific American, 18 June 2022 Researchers studying exoplanets are keen to compare the Sun’s heliosphere with those around other stars. Jamie Carter, Forbes, 7 May 2022 And unlike the Voyager missions, the interstellar probe would be designed specifically to study the outer edge of the heliosphere and its environs. Tim Folger, Scientific American, 18 June 2022 And the sun’s region of influence—its heliosphere—could radically change in size. Jonathan O'callaghan, Scientific American, 6 Jan. 2022 The Oort Cloud exists just beyond the reaches of the heliosphere, a bubble of plasma created by the Sun, Abigail Beall reports for BBC Future. Theresa Machemer, Smithsonian Magazine, 24 June 2021 The heliosphere is the extent of the Sun’s influence. Jamie Carter, Forbes, 27 Apr. 2021 Science instruments on the Interstellar Probe will find out: How the Sun’s plasma interacts with interstellar gas to create our heliosphere. Jamie Carter, Forbes, 27 Apr. 2021 This is where the Voyagers are, beyond the heliosphere. Marina Koren, The Atlantic, 4 Dec. 2020 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'heliosphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

Etymology

helio- + -sphere

First Known Use

1967, in the meaning defined above

Time Traveler
The first known use of heliosphere was in 1967

Dictionary Entries Near heliosphere

Cite this Entry

“Heliosphere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliosphere. Accessed 29 Nov. 2022.

Kids Definition

heliosphere

noun

he·​li·​o·​sphere ˈhē-lē-ə-ˌsfir How to pronounce heliosphere (audio) -ō- How to pronounce heliosphere (audio)
: the region of space that is affected by the sun or solar wind

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