| ISS028 Earth Sciences and Image Analysis Photographic Highlights |
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| ISS028-E-9979 |
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| Massachusetts Coastline in Sunglint: Each day, the Crew Earth
Observations team at NASA’s Johnson Space Center sends specific
ground targets for photography to astronauts on the International
Space Station (ISS). But sometimes the striking displays visible from
orbit provoke the crew to take imagery on their own. One such
display—often visible to the ISS crew due to their ability to look
outwards at angles between 0 and 90 degrees—is sunglint on the waters
of Earth. Sunglint is caused by sunlight reflecting off of a water
surface directly towards the observer—much as light reflects from a
mirror. Variations in the roughness of the water surface scatter the
light, blurring the reflection and producing the silvery sheen of a
sunglint area. The point of maximum sunglint in this image is centered within Cape Cod Bay, the body of water partially enclosed by the “hook” of Cape Cod in Massachusetts (image right). (The U.S. Congress authorized the creation of Cape Cod National Seashore fifty years ago, in August 1961). Sunglint off the water provides sharp contrast with the coastline and the nearby islands of Martha’s Vineyard and Nantucket, both popular destinations for tourists and summer residents. To the north, rocky Cape Ann extends into the Atlantic Ocean; the border with New Hampshire is located approximately 30 kilometers (18 miles) up the coast. Further to the west, the eastern half of Long Island, New York, emerges from extensive cloud cover over the mid-Atlantic and Midwestern States. Persistent storm tracks had been contributing to record flooding in the Midwest at the time this image was taken in late June 2011. Thin blue layers of the atmosphere, contrasted against the darkness of space, are visible along the Earth’s curvature at image left. |
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This service is provided by the International Space Station program and the JSC Astromaterials Research & Exploration Science Directorate. Recommended Citation: Image Science and Analysis Laboratory, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." . |
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