[jbperry]

I don't see a way to slow down. So they would be travelling thru that solar system at .2c. At that speed, they wouldn't be in that solar system for long.

Imagine this was Proxima Centauri doing the same mission on our solar system. Assuming that some of the swarm was on target enough to go thru the inner solar system:

Mars is ~13 light minutes from the sun. So double that for the whole diameter of the orbit, 26 light minutes. At .2c that's 130 minutes total transit time (less really unless it passes really close to the sun). So probably less than 2 hours total in the inner solar system. And that's assuming you can hit that small of a target from 4.25 light years away.

Light distance Sun-Saturn is 1.3 hours. 2.6 diameter. 13 hour transit time for most of the solar system.

You don't know where the planets actually are going to be, or were to point a camera or any other instrument, except the sun. And you have probes that weigh grams.

That's a tough problem, without considering the laser.

But I like thinking about it.