1. The boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet

Type of: bound, boundary, bounds

Encyclopedia: Heliopause

• spoon bread
• spoon food
• spoon-shaped
• spoonbill
• spoonbill catfish
• spoondrift
• spoonerism
• spoonfeed
• spoonfeeding
• spoonflower
• spoonful
• spoonleaf yucca
• spoony
• spoor
• sporadic
• sporadically
• sporangiophore
• sporangium
• Sporanox
• spore
• spore case
• spore mother cell
• spore sac
• spore-bearing
• Spork