Space has no floor. However, it's not really an endless pit, either, because gravity doesn't pull in one direction. It pulls toward objects that have mass. If you have enough forward motion, gravity won't be strong enough to pull you to anything and you will orbit another massive body, but if you don't, then you will fall onto whatever the nearest massive object is, be it a planet, a star, a moon, a black hole, or anything else that has mass.