Astronomy is the oldest of the sciences and every body can take an interest in it. However before you can proceed with this science you have to know some basic facts which are simple and interesting for everybody. Our sun is a star. It is a great, glowing ball of hydrogen and helium gas. All stars are suns, like our own but they are so far away that they appear to us as mere points of light in even the most powerful telescopes.
Many stars have noticeable colors.
The color of a star tells us its temperature. The hottest stars of all appear blue while colder stars are red orange in color. A star brightness is called its magnitude. A star of magnitude 0 is very bright. Stars of magnitude 5 are only just visible.