Can a volcanic eruption launch projectiles into space?

On Earth, no. On a moon, like Jupiter's moon Io, material ejected by volcanoes can get high above the very thin atmosphere of Io, but then it falls back to the surface. a href="http://en.wikipedia.org/wiki/Io_%28moon%29" rel="nofollow"http://en.wikipedia.org/wiki/Io_%28moon%…/a