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

Launched in 1977, Voyager 1 and 2 continue transmitting data past the heliosphere billions of kilometers away, while New Horizons successfully powered its 2015 flyby of Pluto using nuclear heat. — Mrigakshi Dixit, Interesting Engineering, 7 Nov. 2026

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

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