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What are Main Sequence Stars?
If you are a star aficionado, then you know that main sequence stars are those that fuse hydrogen atoms into helium atoms in their core, and if you know that, you might even be familiar with a Hertzsprung-Russell Diagram. If so, then you could probably tell anyone that main sequence stars are those that follow the extensive s-like band cutting diagonally across the graph.
However, if you are familiar with neither the formal definitions nor the graphical depictions of main sequence stars, that doesn't mean these galactic neighbors are completely foreign to you. In fact, you have undoubtedly seen more than you can count.
How?
It is quite simple! Main sequence stars make up about 90% of the stars in the universe (the other 10% is made up of red giants and white dwarves). In fact, our sun is a considerably typical main sequence star. As a G-class star of one solar mass it is truly one of the smaller stellar objects in the main sequence, which has bodies that range from one tenth of our sun's mass to 200 times.