More the temperature of star more it is shifted toward blue end in spectrum and if we decreases the temp color of star directed towards red end on increasing temperature of body, color changes...
Yes as if it isn't hot enough to fuse rapidly the hydrogen atoms then it will not create enough photons to be bright in the sky and we wouldn't be able to see it easily.
The colour of a star is dependant on it's temperature [See related question]. The hotter a star is the more it is shifted to towards the blue end of the spectrum, whereas the cooler a star is the...
The size of a star does not affect it's colour or temperature. The colour of a star is because of it's temperature. The hotter the star the more it appears blue, the cooler a star the more it appears...