he·li·o·sphere | \ ˈhē-lē-ə-ˌsfir , -ō- \

Definition of heliosphere 

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

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Other words from heliosphere

heliospheric \ˌhē-lē-ə-ˈsfir-ik, -ˈsfer-, -lē-ō- \ adjective

Examples of heliosphere in a Sentence

Recent Examples on the Web

To Schwadron, the project has three key components: to study the global heliosphere, to discover the origins of particle acceleration, and to continue to take key measurements of space weather phenomena. Elise Takahama, BostonGlobe.com, "NASA selects UNH researchers for mission to study safer space travel," 8 June 2018 To some scientists, those readings meant Voyager 1 had left the heliosphere. Sarah Fecht, Popular Mechanics, "NASA: Yes! Voyager 1 Has Reached Interstellar Space," 12 Sep. 2013 But though scientists had measured the speed of the solar wind that forms the heliosphere, the properties of the matter beyond it had never been analyzed. Kim Tingley, New York Times, "The Loyal EngineersSteering NASA’s VoyagerProbes Across the Universe," 3 Aug. 2017 Less solar wind would mean that the heliosphere–a bubble around the solar system maintained by particles emitted from the sun–shrinks significantly. David Grossman, Popular Mechanics, "Changes in the Sun's Activity Could Threaten Earth's Electronics by 2050," 1 Feb. 2017

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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Time Traveler for heliosphere

The first known use of heliosphere was in 1967

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Britannica.com: Encyclopedia article about heliosphere

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