Throughout the day we observe that our star changes tonalities: yellow at dawn, white at noon and red at dusk. Why?
This happens when the light of the Sun penetrates the atmosphere, the blue color tends to be dissipated, but not the red and yellow, so we see our star with those tonalities: from the characteristic yellow at dawn, to the strong red at dusk.
The color of a star, on the other hand, depends on its age and size: there are red giants or white dwarfs, for example our Sun, is actually white. Moreover, human sight is not able to distinguish colors in the dark, for this reason we see all white stars at night, except Betelgeuse in the constellation of Orion and Antares in Scorpio, which because they are at the end of their lives, look indistinguishably red if compared to other stars. If the Sun were one of those distant stars, we would see it as a white rather than a yellow star.
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