A fact about stars

Stars appear to twinkle, especially when they are near the horizon. One star, Sirius, twinkles,

sparkles and flashes so much some times that people actually report it as a UFO. But in fact, the

twinkling is not a property of the stars, but of Earth’s turbulent atmosphere. As the light from a

star passes through the atmosphere, especially when the star appears near the horizon, it must

pass through many layers of often rapidly differing density. This has the effect of deflecting the

light slightly as it were a ball in a pinball machine. The light eventually gets to your eyes, but

every deflection causes it to change slightly in color and intensity. The result is “twinkling.”

Above the Earth’s atmosphere, stars do not twinkle.

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Reference nr: MU11025 (see page 53)

Reference nr: MU11072 (see page 121)