What Causes the ‘Twilight Zone’ Between Day and Night?

Imagine the sun is a big, glowing ball in the sky. When it starts to set, its light still travels through Earth's air, but not straight down like when it’s high up. Instead, it spreads out and paints the sky with warm colors like orange and pink. This is called the twilight zone. It happens because the sunlight has to go farther through the atmosphere as the sun gets lower, making the light softer and creating that magical in-between time between day and night.

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Examples

  1. A child watching the sky turn orange just after school lets out.
  2. An old man enjoying a walk as the sun slowly sinks behind the hills.
  3. A bird flying across the sky during the soft light of morning.

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Categories: Science · atmosphere· light· sun· earth· optics