Stars tend to change from one colour to another, as you put it, like a disco ball. This is because the heat inside the star is changing as the stars goes through different growth stages, eventually exploding.
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because when the light enters the atmosphere it goes in zigzags or long dot zigzags
twinkle stars
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Stars twinkle due to the Earth's atmosphere causing the light from stars to refract as it passes through different layers of varying density. In winter, the Earth's atmosphere is typically more stable and less turbulent, resulting in less twinkling of stars compared to other seasons. This stability reduces the amount of atmospheric distortion that causes the twinkling effect, leading to clearer and steadier views of stars in the winter sky.
Stars are not twinkling really. It is because of the atmosphere of the earth due to which they appear twinkling. However if they are seen from above the atmosphere of earth then they appear stationary.