heliosphere

noun
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

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Other Words from heliosphere

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

Examples of heliosphere in a Sentence

Recent Examples on the Web 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, "Solar Orbiter Launches on a Mission to Study the Sun's Poles," 10 Feb. 2020 Once scientists process that data here on Earth, scientists hope to have a clearer understanding of how the sun and its dynamic heliosphere works. Jennifer Leman, Popular Mechanics, "How to Watch Solar Orbiter Launch to the Sun Tonight," 9 Feb. 2020 Based on Voyager 2's crossing, the astronomers learned that the heliosphere has a smooth but defined boundary between the two types of plasma. Ashley Strickland, CNN, "What Voyager 2 has learned since entering interstellar space," 4 Nov. 2019 The orbiter is set to study the sun’s heliosphere, that protective plasma bubble that encases our solar system, in an effort to better understand solar wind, space weather, and the sun’s magnetic field. Jennifer Leman, Popular Mechanics, "How to Watch Solar Orbiter Launch to the Sun Tonight," 9 Feb. 2020 Solar Orbiter will connect what's going on at the sun with what's happening out in the heliosphere in unprecedented detail, mission team members have said. Amy Thompson, Scientific American, "Solar Orbiter Launches on a Mission to Study the Sun's Poles," 10 Feb. 2020 The probe is particularly well suited to study how the Sun generates its heliosphere and the solar wind. Eric Berger, Ars Technica, "This year may finally fulfill the promise of private human spaceflight," 15 Jan. 2020 The heliosphere’s outermost edge, called the heliopause, marks the start of interstellar space. Michael Greshko, National Geographic, "Interstellar space even weirder than expected, NASA probe reveals," 4 Nov. 2019 Thinking of the heliosphere like a wind sock, astronomers would want a probe that could essentially travel down the tail created by the sun's wind, extending the boundary of the solar system. Ashley Strickland, CNN, "What Voyager 2 has learned since entering interstellar space," 4 Nov. 2019

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

Time Traveler

The first known use of heliosphere was in 1967

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Statistics for heliosphere

Cite this Entry

“Heliosphere.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliosphere. Accessed 24 Sep. 2020.

More from Merriam-Webster on heliosphere

Britannica.com: Encyclopedia article about heliosphere

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