* Everything in space is affected by gravity. Even things that seem to be traveling "through" space are still influenced by the gravity of planets, stars, and even galaxies.

* Things can escape Earth's gravity. Rockets, satellites, and probes can be launched with enough speed to escape Earth's gravitational pull. They won't fall back down, but they still travel through space and are affected by other gravitational forces.

So, the answer is really nothing. Everything in space is subject to gravity in some way.

However, there are some things that *appear* to travel through space and not fall to Earth:

* Light: Light travels at a constant speed and isn't affected by gravity in the same way objects are. It bends around massive objects (like stars), but doesn't "fall" in the traditional sense.

* Dark matter: We can't directly observe dark matter, but we know it exists based on its gravitational effects. It's thought to be spread throughout the universe and doesn't clump together like normal matter.

* Empty space: This might seem like a silly answer, but space itself can expand, and this expansion carries galaxies and other objects further apart.

Let me know if you'd like to explore any of these concepts in more detail!