What Causes Stars to Twinkle in the Night Sky?

Stars look like they're twinkling because the air above us is moving around. Imagine you're looking at a light through a wobbly piece of glass, it flickers, right? The Earth’s air moves in layers, and it messes up how we see the stars.

What Causes It?

When starlight travels from space to Earth, it passes through our atmosphere. This is like walking through a room full of moving fans. Each layer of air changes the way light moves, making the stars seem to flicker or twinkle.

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Examples

A candle flickers when the wind blows, just like how stars twinkle when air moves.
Imagine watching a fish in an aquarium, if the water is wobbly, the fish seems to dance.
When you look at a light through a moving curtain, it makes the light appear to jump around.

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Categories: Space · stars,light,atmosphere,astronomy,night sky