The color star with the lowest surface temperature is red.

Here's why:

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

* Red Stars: Red stars are the coolest, with surface temperatures ranging from about 2,500 to 3,500 degrees Celsius.

* Other Colors: As stars get hotter, they become:

* Orange

* Yellow (like our Sun)

* White

* Blue (the hottest)

Think of it like a piece of metal being heated. As it gets hotter, it glows red, then orange, then yellow, and finally white-hot. The same principle applies to stars!