heliosphere

noun 0.818

helio

noun 0.627

solar wind

noun 0.572

helioseismology

noun 0.572

heliox

noun 0.568

solar corona

noun 0.562

ergosphere

noun 0.557

helium fusion

noun 0.522

heliocentrism

noun 0.516

helium burning

noun 0.516

event horizon

noun 0.510

stellar wind

noun 0.506

ionosphere

noun 0.504

helium

noun 0.503

radiation belt

noun 0.502

solar energetic particle

noun 0.501