In preparing for space combat they vent the ship and wear space suits, expecting the ship to be poked full of holes. When ships travel through space, they can

In preparing for space combat they vent the ship and wear space suits, expecting the ship to be poked full of holes. When ships travel through space, they can be seen traveling in "reverse" as they arrive, because they are burning their engines to decelerate. Ships only have "gravity" when they are running their engines.