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1. Stars come in different brightnesses, sizes and colours.

2. In order of brightest to dimmest star, the sequence runs OBAFGKM. (Most people can tell you that our Sun is classed as a G type star). Here is the classification sequence

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3. The fact that the majority of stars we see in the sky are brighter than the Sun, also means that most stars in the galaxy are too dim for us to see!

4. In the past couple of decades astronomers have added a new member to this stellar zoo: brown dwarf stars. These are too small to be classed as proper stars. A star must produce its own heat and light. The little energy they radiate is mainly infra-red light.