Here's why:

* Temperature and Color: A star's color is directly related to its surface temperature.

* Hotter Stars: Hotter stars emit more blue and white light, which is why they appear blue or white.

* Cooler Stars: Cooler stars emit more red and orange light, which is why they appear red or orange.

* Medium Temperature Stars: Medium temperature stars fall in the middle, emitting more yellow light. Our Sun is a good example of a medium temperature, yellow star.