* A celestial object: This is the most common interpretation. Planets, stars, moons, asteroids, comets, and even galaxies are all pieces of matter moving through space.
* A spacecraft: Humans have built machines that travel through space, like the International Space Station or the Voyager probes.
* A particle: Even tiny particles, like atoms or photons, can move through the vast emptiness of space.
* A stream of gas or dust: Space is not completely empty. There are clouds of gas and dust that move through it, sometimes forming new stars and planets.
So, to answer your question more precisely, you need to be more specific about what kind of "matter" and what kind of "space" you are interested in.
