Q: What happens when an interstellar space craft or inner solar system space craft collides with a relatively small solid buckyball cluster?
A: A dent in the hull and minor deflection from course.
"Astronomers using data from NASA's Spitzer Space Telescope have, for the first time, discovered buckyballs in a solid form in space. Prior to this discovery, the microscopic carbon spheres had been found only in gas form in the cosmos." - NASA's Spitzer Finds Solid Buckyballs in Space