So you just take along a little compressed air and repel the stuff before it gets there. This would be one very, very slow avalanche.
Right now, spacecraft are made out of sheet metal and tin foil. Maybe someday when we discover how to tap the vacuum energy we'll build them sturdier. Reminds me of Futurama where they're underwater or something (obviously my memory is a steel trap, with significant rust) and the question comes up as to how many atmospheres of pressure the ship can withstand. And since it was designed to operate between Earth and space, where there is no pressure, the answer is between zero... and one. Even slow-moving rock
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/5mqeAfNf4Mw/story01.htm
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