Astronomer here! There are a lot of bad things people think are true about astronomy because of movies, but to just highlight one: asteroid fields are completely different than what most people think they're like. People tend to think of this crazy cramped field like in Star Wars: The Empire Strikes Back as the norm, but in actuality there is, on average, millions of kilometers between asteroids!

Think of it this way: there are ~100,000 asteroids that are larger than a kilometer or so. If we think of the asteroid belt between Mars and Jupiter, that still leaves you an average spacing of 5 million kilometers between asteroids. In fact, there are so few that rather than having to worry about sending spacecraft through it due to too many, NASA had serious issues when Galileo was flying through on its way to Jupiter to ensure it passed close enough to asteroids to photograph them!

If anything, a planetary ring system is probably closer to the movie conception of an asteroid field as those consist of billions of particles... but those particles are primarily ice, and only the size of a speck of sand for the most part, so it's nowhere near as dramatic in some ways. Cassini will be going through Saturn's rings next year though, so we'll learn a lot more about them then!