User blog comment:PitaKang/Funday Monday 3: What would an interstellar civilization look like?/@comment-4621372-20130503231446/@comment-32656-20130505045446

We do not know if these methods work on not - that is why they are theories.

Most of them propose methods of going around lightspeed, not going it or even some sort of percentage of it. It is, in fact, not breaking the "barrier."

The number is not a tenth of lightspeed, but half - and it's more of a problem with radiation than impacts.

There are, in fact, numerous things that can be done about both - not hard to detect various items ahead of time, and either move them or otherwise deal with them. It's how NASA protects spacecraft today.

Sorry, the Alcubierre drive has nothing to do with wormholes. It works by contracting space in front of the craft and expanding space behind it, thus "leaping forward." You incorrectly describe it overall, as well.