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I'm assuming that the question is "why do the stars twinkle"

The light from stars passes through our atmosphere and gets refracted several times due to the varying density of the air. Also, this density doesn't remain constant at each layer. This constantly alters the light wave direction (which gets bent due to refraction) and the luminosity (due to varying density). This gives us an illusion that the star is getting dimmed and brighting up.

It is similar to watching the sun through a mirage and it looks as if we are watching it through water. In this case, the hot air is distorting the sun's light.

If we are in the outer space, the stars dont twinkle. they just glow.

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12y ago

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