Lol @ adetola, I guess you must have believed in this before you got to know few things.

In response to your question, I can summarize from this article, the following :

As you can see from NASA diagram above, It was observed that Stars with less mass than the sun are usually smaller and cooler, which become much fainter in visible light.

1. That they come in a variety of sizes. Larger stars usually shine more brightly than smaller stars do.
2. That they are not at the same DISTANCE from earth. The closer a star is to the earth, the brighter it will appear to us