The Milky Way got its name because it looks like someone spilled some milk across space.
The Milky Way has as many planets and stars as there are grains of sand on a beach. It contains stars, planets, moons, and our own solar system. There are relatively bigger galaxies than the Milky Way, but there are also smaller ones. A galaxy is an empty space between the stars and if two galaxies get too close to each other they can put each other out of shape.
The solar system has eight planets that are separated by an asteroid belt. The inner planets closest to the sun, also known as the terrestrials, are called Mercury, Venus, earth, and mars.
Saturn, Jupiter, Neptune, and Uranus are the four outer planets in the solar system. These planets are composed of gas and liquid. These four outer planets are also known as the Jovian planets, or gas giants. They are significantly larger than the terrestrial planets that are located on the other side of the asteroid belt, which are closer to the sun.
The inner planets also have moons. The Earth has one moon. Mars has two small moons.
“If the sun was the size of a large beach ball, the Earth would be as small as a pea and the moon would look like a pinhead," according to one look about space. This is just a small fragment out of the immensity of the Milky Way.
[Sources: 100 Things you should know about space; www.universietoday.com]