Earth is a tiny planet in a vast space called the Universe. The Universe is really, really big and has LOTS of stars, planets, and other space things in it. Earth is a small part of the Universe and it's in the middle of the Milky Way galaxy. The Milky Way is like a big disk and Earth is about two-thirds of the way out from the center. Earth is just like a little speck of dust compared to the entire Universe.