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

Decades beyond its original mission, Voyager 2 has begun studying the Kuiper Belt environment beyond the Sun’s protective heliosphere, giving scientists measurements from a region no spacecraft had been designed to reach. — Josh Dinner, Space.com, 20 Aug. 2026

The measurements have provided unprecedented data about regions of varying density beyond the heliosphere. — Ashley Strickland, CNN Money, 6 Aug. 2026

To this day, the probes are the only spacecraft in history to operate outside of the heliosphere – the protective bubble of particles and magnetic fields generated by the sun. — Eric Lagatta, USA Today, 21 Apr. 2026

The space agency's Interstellar Mapping and Acceleration Probe, or IMAP, is expected to continue its mission for two years, using scientific instruments to chart the boundaries of the heliosphere and what's going on inside of it. — Emily Mae Czachor, CBS News, 3 Feb. 2026

Word History

Etymology

helio- + -sphere

First Known Use

1967, in the meaning defined above

Rhymes for heliosphere

• atmosphere
• biosphere
• centromere
• chemosphere
• chromosphere
• hemisphere
• hydrosphere
• lithosphere
• mesosphere
• microsphere
• miserere
• mountaineer

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