The stars twinkle in the sky why ?

The twinkling of stars is caused by the Earth's atmosphere. When starlight passes through the layers of the atmosphere, it is refracted or bent in different directions due to the varying density and temperature of the air. This refraction causes the light to appear to flicker or twinkle as it reaches our eyes on the ground. The twinkling effect is more noticeable when stars are low on the horizon, as the light has to pass through more layers of the atmosphere.

Stars twinkle in the sky because of the Earth's atmosphere. The atmosphere is a layer of gases that surrounds the Earth. When light from a star passes through the atmosphere, it is refracted, or bent. This is because the density of the atmosphere is not uniform, and the light waves travel at different speeds through different parts of the atmosphere.

The refraction of light causes the stars to appear to twinkle. When the light from a star passes through a turbulent part of the atmosphere, it is refracted in different directions. This causes the star to appear to move back and forth. The twinkling of stars is also caused by the fact that the Earth's atmosphere is constantly moving. As the atmosphere moves, it causes the light from stars to be refracted in different directions. This also causes the stars to appear to twinkle.