| Term: | Heliosphere |
| Definition: |
The heliosphere is our entire solar system, as defined by the bubble created by the outflow of particles from the sun called the solar wind, which streams far past the outermost planets, six to nine billion miles away from the sun. Solar particles speed outward from the sun, pushing back the material in the rest of space, known as the interstellar medium. The boundary between the two defines the edges of the heliosphere. |