Linked from
The 16 pages that link to Heliosphere, each with the reason it gives.
Stellar windBroader topic: It is the large-scale structure created by our star’s wind.
Solar windNarrower topic: The wind fills and helps define this region around the Sun.
Solar coronaNarrower topic: The corona feeds the solar wind that fills the heliosphere.
Voyager 2Related: Voyager 2 crossed its outer boundary, the heliopause, into interstellar space.
HeliophysicsBroader topic: It is the domain where solar plasma and magnetic fields dominate.