1. The main sequence of the HR- Diagram is to show the relationship between how bright a star is and how hot it is.
2. The percentage of main sequence stars are 90%.
3. The sun is a main sequence star.
4. The sun will explode about at least 1 billion years from now.
5. The HR-Diagram has all hot stars to the left and cooler stars on the right. This diagram also gives you an idea of the brightness and dimness
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