he·​li·​o·​sphere | \ ˈhē-lē-ə-ˌsfir How to pronounce heliosphere (audio) , -ō- How to pronounce heliosphere (audio) \

Definition of heliosphere

: the region in space influenced by the sun or solar wind

Other Words from heliosphere

heliospheric \ ˌhē-​lē-​ə-​ˈsfir-​ik How to pronounce heliosphere (audio) , -​ˈsfer-​ , -​lē-​ō-​ \ adjective

Examples of heliosphere in a Sentence

Recent Examples on the Web 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 Kurth once published a commentary in a science journal that said leaving the heliosphere was more or less the same as leaving the solar system. Marina Koren, The Atlantic, 4 Dec. 2020 The sun releases a steady current of high-energy particles in all directions, all the time, and this solar wind encompasses the planets, their moons, and other celestial bodies in a protective bubble called the heliosphere. Marina Koren, The Atlantic, 4 Dec. 2020 Both Voyager 1 and Voyager 2 are just outside the heliosphere, a bubble of magnetic fields and particles created by the sun. Ryan Prior, CNN, 3 Nov. 2020 Its main goal is to answer the question: How does the sun create and control the heliosphere — the huge protective bubble that surrounds our solar system — and why does that bubble change over time? Amy Thompson, Scientific American, 10 Feb. 2020

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.

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First Known Use of heliosphere

1967, in the meaning defined above

History and Etymology for heliosphere

helio- + -sphere

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The first known use of heliosphere was in 1967

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Cite this Entry

“Heliosphere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliosphere. Accessed 16 Jan. 2022.

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More from Merriam-Webster on heliosphere

Britannica.com: Encyclopedia article about heliosphere


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