> In all seriousness, what can be done about this sort of thing(mitigating it)? The most important thing would be to make sure that we can see these things wel

> In all seriousness, what can be done about this sort of thing(mitigating it)? The most important thing would be to make sure that we can see these things well in advance. No defense is going to work if you don't see the threat at all. Currently we can't see well in the region enclosed by Earth's orbit, in the direction of the sun. The B612 foundation was going to launch the Sentinel Space Telescope for that purpose, but they lost their funding. https://en.wikipedia.org/wiki/Sentinel_Space_Telescope https://en.wikipedia.org/wiki/Sentinel_Space_Telescope