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The brightness of stars varies because of many reasons.

1. The Distance. Some Stars are far away, and the light takes longer to reach us, so the star only appears to be darker then stars around it that may appear brighter.

2.The size. Some stars are massive, and appear brighter then others simply due to their size.

3. It isn't a star. what you may be looking at isn't a star. You may be seeing a satellite, quasar, or even a close white dwarf or neutron star.

4. Finally, you may be looking at the milky way. in which case, they all appear to be brighter then stars outside it. This also falls under distance.

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Q: Why do some starts appear brighter than others?
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