heliosphere

noun

he·​li·​o·​sphere ˈhē-lē-ə-ˌsfir  -ō- 

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

heliospheric

ˌhē-lē-ə-ˈsfir-ik 

-ˈsfer-

-lē-ō-

adjective

Examples of heliosphere in a Sentence

Recent Examples on the Web

Scientific American senior news reporter Meghan Bartels follows two beloved spacecraft, Voyagers 1 and 2, on their epic tour past the outer planets, across the edge of the sun’s influence (the heliosphere) and into interstellar space. —Jeanna Bryner, Scientific American, 18 Mar. 2025

Together, the quartet will function as one instrument to make global, 3D observations of the entire inner heliosphere. —Sharmila Kuthunur, Space.com, 8 Mar. 2025

The Voyager team used data from the instrument to determine exactly when and where Voyager 1 exited the heliosphere and entered interstellar space. —Ashley Strickland, CNN, 5 Mar. 2025

For years, the cosmic ray subsystem’s three-telescope array observed fluctuations from protons and other deep space energies, and was integral in determining when and where Voyager 1 exited the heliosphere. —Andrew Paul, Popular Science, 5 Mar. 2025

Word History

Etymology

helio- + -sphere

First Known Use

1967, in the meaning defined above

Rhymes for heliosphere

• acyclovir
• asthenosphere
• ganciclovir
• magnetosphere
• atmosphere
• biosphere
• centromere
• chemosphere
• chromosphere
• hemisphere
• hydrosphere
• lithosphere

Kids Definition

heliosphere

noun

he·​li·​o·​sphere ˈhē-lē-ə-ˌsfir  -ō- 

: the region of space that is affected by the sun or solar wind