Figure 2: This is a 'scary' diagram showing the regions of the heliosphere (click on image for larger view). There really isn’t any fire-like cloud ramming into the heliosphere! It also shows the approximate locations of Voyagers 1 and 2. Voyager 1 is traveling faster and has crossed into the heliosheath. (Courtesy: NASA / Walt Feimer).
This image appears in the Technology Through Time article, #62: "Where is the heliopause?".
The core of the sun is nearly as dense as lead, and has a temperature of 15 million °C.