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

The mission's data will also help scientists map the outer boundary of the heliosphere, the vast bubble around our solar system that's dominated by the sun's solar wind and magnetic field. —Mike Wall, Space.com, 24 Sep. 2025

The Sun's movement through the Milky Way galaxy forms a shock wave on the front side of the heliosphere, similar to the wave created by the bow of a ship moving through water. —Kyle Orland, ArsTechnica, 24 Sep. 2025

The information collected by these probes is helping scientists learn about the heliosphere’s cometlike shape. —Ashley Strickland, CNN Money, 24 Sep. 2025

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, 8 Sep. 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