Do you know of a story about a planet (possibly earth) that is about to be destroyed by a meteor, so the occupants of the planet build ships and evacuate it, right as the occupants take off the story shifts to a baseball with a layer of "dust" escaping it. Turns out the planet ends up being a baseball, and the dust are the inhabitants.
The entire story takes place between the pitch release and the catch of a non professional baseball game.