https://www.google.com/amp/s/nerdist.com/article/89000f-wall-of-plasma-solar-system/%3famp

Hi I don't know anything about space or math or physics. I'm wondering how the voyager 2 made it's way through part of this plasma field that's 90,000 degrees farenheit and how it can be stuck and not melted lol. So does this mean all asteroids come from within our solar system? How does density and heat work? Do magnetic fields push the heat away? I don't know if these are stupid questions. Thanks