Answer:
Well, first off, stars are all different. The reason some stars look different could be because of their color, the tempurature difference, and in some cases if the stars are using gas or rocks to fuel themselves.
The color of a star is linked to its surface temperature. So the hotter the star, the shorter the wavelength of light it will emit. The hottest ones are blue or blue-white, which are shorter wavelengths of light. Cooler ones are red or red-brown, which are longer wavelengths.
