Heliosphere
/ˈhiːli.oʊ.sfɪr/noun
The vast bubble-like region of space dominated by the Sun’s solar wind and magnetic field.
Did you know?Heliosphere is a modern scientific coinage built from Greek roots, and its name literally frames the Sun as a sphere of influence wrapping the entire solar system.
Etymological Timeline
Ancient Greek
Greek
hḗlios
“the Sun”
Ancient Greek
Greek
sphaîra
“ball, globe, sphere”
Late 19th Century
English
heliosphere
“a term coined for the Sun’s spherical region of influence”
Modern English
English
heliosphere
“the outer bubble of solar wind surrounding the solar system”