All right. The vacuum issue is resolved, I think. Space is still a relative vacuum, but since it isn’t necessarily infinite in a flat sense, and since the particles will still collide with others, I can accept the idea of pressure for matter travelling through it. However, this still leaves me with a few burning questions, such as: how come John Donne can make wordplay on “sun rising in the East” sound profound while everywhere else it’s just a cheap pun? Can particles of antimatter have pressure? Also, why can’t I special order Dutchy of Blenshaf gyro wheels at our hardware store?