As the sunlight shines on a portion of our planet Earth, the shadow line, or terminator, is diffused, which results in a gradual transition between light and darkness. This is how twilight looks from above our planet.
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This photo was taken in June 2001 from the International Space Station.
(Image Credit: ISS Expedition 2 Crew, Gateway to Astronaut Photography of Earth, NASA)
Source: neatorama