Let's talk about our Solar system. The solar system consists of our stars, sun, and all of our planets.
Stars are like small balls of gas. They contain mostly helium and hydrogen. In earth we have electrons, protons, and neutrons. Fun fact an iron nucleus has 26 protons and 30 neutrons. Also, we have something called redshift which is where electromagnetic radiation from an object undergoes an increase in wavelength.
In our earth we have a solar neubla which is a type of cloud. Let's talk about galaxies. Galaxies like to clump together because of dark matter. Dark matter is part of some of the matter we have on our universe. Some say galaxies are why our universe is expanding because they are moving farther apart from each other.