Maybe we already have the materials, but the convention is to stick (ha) with what works.
We don't, though. In order to make the ship significantly stronger we have to spend more mass. Carbon fiber might one day be the right material, but right now it's still prone to cracking in many terrestrial applications.
Perhaps also a little static generator could polarize dust so it is more attracted to the asteroid than a craft.
That's a good or even great idea, but it won't help with rocks for the foreseeable future.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/5mqeAfNf4Mw/story01.htm
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