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Why do stars twinkle? | Space

The antennas of the Atacama Large Millimeter/submillimeter Array (ALMA), set against the splendour of the Milky Way. (Image credit: ESO/B. Tafreshi (twanight.org))

Look up at the sky on a clear night in a dark area, and the stars appear to twinkle. The concept is so well established that it’s the premise of one of the most popular children’s songs of all time. 

But what’s the science behind this sparkly sight? What is it about stars that makes them twinkle?

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