The reason why we are in this Solar system is because the Sun has so much mass that it is the center of our gravity. Nasa: Enough about the Sun. Let's talk about how the planets aren't the only things in our Solar System. There are tons of different things in the Solar System. For example, different asteroids, comets, asteroid belts, and even dust clouds like the one we call the Oort Cloud which is considered to be the edge of the Solar System. Space explorers also think that there might be a ninth planet out there. They call the planet, Planet X. Even though they have never seen it, they have calculated it using math. Anon) Planet X is a very interesting thing in our vast Solar system, we don't really know if it is there or not, but for our Solar system to make sense it has to be there. There are so many things in space that we don't know about. There are many things we haven't discovered, but whole plants. It's crazy to me that we have telescopes that can reach other Solar systems but can't see if there is another planet hiding somewhere in our solar