No sudden, sharp boundary marks the passage of da into night i this gorgeous viewof ocean and clouds over ou fairplanet Earth.Instead, the shadow line o terminator isdiffuse and showsthe gradual transition to darkness we experience as twilight.With the Sun illuminating the scene from the right,the cloud tops reflect gently reddene sunlight filteredthrough the dusty troposphere, the lowest layer of the planet's nurturin atmosphere.A clear high altitude layer,visible along the dayside's upper edge scatters bluesunlight and fades into the blackness of space.This pictur actually is a single digitalphotograph taken in Juneof 2001 from the International Space Statio orbiting at analtitude of 21 nautical miles.
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