Okay, so I'm working on a novel and I'd like to have a dense asteroid field, something akin to the old ESB Hoth field, though it doesn't need to match that exactly. The notion is there is an advanced civilization going into such a dense field to pull out desirable mine-able ores. I'm looking for a plausible explanation for how such a field could form, and persist for at least around 100 years.
So my rough parameters for such a field:
- Reasonably dense, with at least building size asteroids, up to city size would be good.
- Dense enough that collisions between the medium sized objects are not uncommon.
- Not dense enough to immediately form into a planetary body.
- It doesn't need to exist for an extended period of time, though 100 years or so would be good, event as short as 5-10 years would be ok
I was thinking something like a collision of dwarf planets or possibly small moons would create such a field, on a short time frame at least. Eventually, I would assume either form a ring, collapse into a moon, or dissipate entirely, but for a while it would be a dense area of debris that would be hazardous to navigate.
So would that be a plausible explanation, or can anyone suggest a way for such a dense asteroid field to exist, even if only for a limited time. Thanks!
Update/Clarification #1: First thanks for the answers so far.
Okay, I can see there being a bit of confusion here. What I'm looking for is a plausible explanation for a dense asteroid field similar to the one seen in the escape from Hoth in Empire Strikes Back. It need not be a long lived phenomenon in astronomical terms ( ie 10-100 years is good ), but would need to exist in such a condition for at least 10 years. It also doesn't need to be huge in terms of area, so something like a few thousand kilometers is fine, but with a minimal size of 10km in height / width / depth. The means of creating such a field can be natural or artificial. In the end I'm looking for a dense Asteroid field for use in a rough and tumble flight scene. Of course, if that is not possible, I can figure out some way to recreate the scene.