Earth's Twilight from ISS

In this image taken from Space Station, the shadow line or terminator is diffuse and shows the gradual transition to darkness we experience as twilight.    Image © ISS Expedition 2 Crew, Gateway to Astronaut Photography of Earth, NASA

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With the Sun illuminating the scene from the right, the cloud tops reflect gently reddened sunlight filtered through the dusty troposphere, the lowest layer of the planet’s nurturing atmosphere.

This picture taken in June of 2001 from an altitude of 211 nautical miles.

source APOD