The Sun's hot corona continuously expands outward into space, creating the solar wind, a stream of charged particles, the spatial extent of which defines the heliosphere and with an outer boundary that is the heliopause at roughly 100 astronomical units.
The Sun's hot corona continuously expands outward into space and with an outer boundary. This outer boundary is the heliopause at roughly 100 astronomical units. Space is creating the solar wind the spatial extent of which defines the heliosphere. The solar wind is a stream of charged particles.