Question

why do stars appear to twinkle at night?

Answer 1

Hope this will help you

Answer 2

$\huge\mathfrak\orange {Hello\:Mate}$

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Our atmosphere slows down light’s travel by a slight margin, resulting in slight variations of how light passes through it. You see this when hot air passes before you and causes ripples in the objects behind it.

Stars are points of light, unlike the observable planets which are very small disks of light. As a result, light from stars, passing through the atmosphere, has only one point through which it passes to get to your eye. When the atmosphere causes these tiny ripples, the light is interfered with in subtle ways. You see this as a twinkling of the light. Planets glow steadily because the light is traveling through a number of places in the atmosphere to get to your eye. If one tiny area is slightly interfered with, the adjacent area is not interfered with. The result is that as a whole, light seems to arrive steadily from a planet, whereas light from a star is very easily distorted, hence the twinkling effect.

I had the privilege of observing a total solar eclipse recently, and one thing I had never heard of until this was the tendency of the light from the sun to appear to flow and ripple as the moon has very nearly totally covered the observable sun. Looking down at the ground at the moment just before totality, the entire ground was covered with sunlight rippling as if it was light passing through warm air, and what it actually was was the sunlight no longer passing through several points, but a very reduced number of points. Instead of all the interference just cancelling each other out, you could see the rippling of this interference for a few seconds before the light vanished in totality.

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