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Susitna Glacier, Alaska. Like rivers of liquid water, glaciers flow downhill, with tributaries joining to form larger rivers. But where water rushes, ice crawls. As a result, glaciers gather dust and dirt, and bear long-lasting evidence of past movements. Alaska’s Susitna Glacier reveals some of its long, grinding journey in this image, taken from space on August 27, 2009. The satellite image combines infrared, red and green wavelengths to form a false-color picture. Vegetation is red and the glacier’s surface is marbled with dirt-free blue ice and dirt-coated brown ice. Infusions of relatively clean ice push in from tributaries in the north. The glacier surface appears especially complicated near the center of the image, where a tributary has pushed the ice in the main glacier slightly southward. In the lower left corner of this image, meltwater lakes can be seen on top of the ice.
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Like rivers of liquid water...
Susitna Glacier
These cloud formations were seen over the western Aleutian Islands. Their color variations are probably due to differences in temperature and in the size of water droplets that make up the clouds. This image was acquired by the Landsat 7 satellite on June 16, 2000.
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Aleutian clouds
Aleutian clouds
This stunning image, taken on July 27, 2000, shows the Lena River in Russia, one of the largest rivers in the world, which is some 2,800 miles (4,400 kilometers) long. The Lena Delta Reserve is the most extensive protected wilderness area in Russia. It is animportant refuge and breeding ground for many species of Siberian wildlife. Original high-resolution image here.
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This stunning image, taken ...
Lena Delta, Russia
A changing landscape in the heart of Madagascar, showing drainage into the sea in the Betsiboka Estuary due to decimation of rainforests and coastal mangroves. 
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The heart of Madagascar
The heart of Madagascar
A space suit floats freely away from the International Space Station in a scene reminiscent of a sci-fi movie. But this time, no investigation is needed. The suit is actually the world's latest satellite and was launched on February 3, 2006. Dubbed SuitSat-1, the unneeded Russian Orlan spacesuit filled mostly with old clothes was fitted with a radio transmitter and released to orbit the Earth.
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FLOATING FREE: A space suit...
Floating free
This interesting image shows the world’s largest glacier, Lambert Glacier in Antarctica, and icefall that flows into it. Ice flows like water, albeit much more slowly. Cracks can be seen in this icefall as it bends and twists on its slow descent 1300 feet (400 meters) to the glacier below. The image was taken by the Landsat-7 satellite on December 2, 2000 and is a false-color composite made from infrared, red and green wavelengths. The image has also been sharpened using the sensor’s panchromatic band.
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Icefall
Icefall
On the edge of the Kalahari Desert in Namibia, sand dunes are encroaching onto once-fertile lands in the north. Healthy vegetation appears red in this image; in the center, notice the lone red dot. It is the result of a center-pivot irrigation system, evidence that at least one optimistic farmer continues to work the fields despite the approaching sand. This image was acquired by the Landsat 7 satellite on August 14, 2000. This is a false-color composite image made using near infrared, red and green wavelengths. The image has also been sharpened using the sensor's panchromatic band.
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"The Optimist," Kalahari De...
'The Optimist,' Kalahari Desert, Namibia
The United States' first spacewalk, made by Ed White on June 3, 1965 during the Gemini 4 mission. On the third orbit, White opened his hatch and used a hand-held manuevering oxygen-jet gun to push himself out of the capsule. After the first three minutes the fuel ran out and White manuevered by twisting his body and pulling on the tether. His extra-vehicular activity started over the Pacific Ocean near Hawaii and lasted 23 minutes, ending over the Gulf of Mexico. The photograph was taken by commander James McDivitt.
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The United States' first sp...
Space odyssey
Earth and its Moon are nicely framed in this image taken from the aft windows of the Space Shuttle Discovery in 1998. Discovery, on mission STS-95, was flying over the Atlantic Ocean at the time this image was taken.
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MOON FRAME: Earth and its M...
Moon frame
'Ship tracks' above the northern Pacific Ocean. These patterns are produced when fine particles from ship exhaust float into a moist layer of atmosphere. The particles seed new clouds or attract water from existing cloud particles. Image taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard NASA’s Aqua satellite on July 3, 2010.
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SHIP TRACKS: 'Ship tracks' ...
Ship tracks
​ A spring phytoplankton bloom off of the Alaskan coast.
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Churning in the Chukchi Sea
Churning in the Chukchi Sea
The Dasht-e Kevir, or Great Salt Desert, is the largest desert in Iran. It is primarily uninhabited wasteland, composed of mud and salt marshes covered with crusts of salt that protect the meager moisture from completely evaporating. This image was taken by the Landsat 7 satellite on October 24, 2000. It is a false-color composite image made using infrared, green and red wavelengths. The image has also been sharpened using the sensor’s panchromatic band.
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Great Salt Desert, Iran
Great Salt Desert, Iran
Off the coast of Argentina, strong ocean currents stirred up a colorful brew of floating nutrients and microscopic plant life just in time for the summer solstice. Image taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on December 21, 2010.
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PATAGONIA BLOOMS: Off the c...
Patagonia blooms
This image, captured by the Landsat-8 satellite, shows the view over Western Australia on May 12, 2013. The image shows rich sediment and nutrient patterns in a tropical estuary area and complex patterns and conditions in vegetated areas.  The image is enhanced and involved masking, separately enhancing and then reassembling water and land portions of the image. The water patterns are the result of an RGB display of Landsat-8’s red, blue, and ultra-blue bands. Land is shown using short-wavelength-infrared, near-infrared and green. 
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Color Explosion
Color explosion
Captured onboard a NASA Operation IceBridge flight to survey glacier change in a warming world, this photograph shows a beach and stream in Russel Fjord, Alaska, near the terminus of Hubbard Glacier.
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Beached bergs in Alaska
Beached bergs in Alaska
This simulated natural color image shows the Coco River, between Nicaragua and Honduras, as seen from space on December 5, 2002. As it makes its way to the Caribbean Sea, the Coco River forms the border between the two countries. The coastline, known as the Mosquito Coast, is of low relief and has plentiful water bodies, relic shorelines and high temperatures. Mosquito Coast derives its name from its principal inhabitants, the Miskito Indians, whose name was corrupted into Mosquito by European settlers. The Mosquito Indians, of whom there are several tribes, are short in stature and very dark-skinned. The first European settlement in the Mosquito country started in 1630, when agents of the English-chartered Providence Company established friendly relations with the local inhabitants. The image shown covers an area of 29 x 39 kilometers (18 x 24 miles).
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This simulated natural colo...
Coco River, Nicaragua and Honduras
Vivid colors and bizarre shapes come together in this artistic, fantastical image, taken from space on June 15, 2005. The labyrinth of exotic features was spotted along the edge of Russia's Chaunskaya Bay (shown by the vivid blue half circle) in northeastern Siberia. Two major rivers, the Chaun and Palyavaam, flow into the bay, which in turn opens into the Arctic Ocean. Ribbon lakes and bogs are present throughout the area, created by depressions left by receding glaciers.
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Vivid colors and bizarre sh...
Siberian ribbons
This map shows the bright lights of cities and wildfires set against the inky black backdrop of night. The image is actually a composite of satellite data collected over a number of days in April 2012 and October 2012, and is the result of 312 orbits and 2.5 TB of information. The lights seen here are not just from cities; they are also from wildifires, lightning, gas flares and reflected moonlight. Because the image is a composite of several days’ worth of data, fires and other points of light may have been picked up by the satellite and integrated into the composite image even though they were temporary, making some rural locations (such as in Australia) seem brighter than they really are on a typical day.
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Night lights, big cities
Night lights, big cities
This image shows a spinning formation of ice, clouds and low-lying fog off the eastern coast of Greenland. This image was acquired by the Landsat 7 satellite on May 14, 2001. This is a false-color composite image made using infrared, red and green wavelengths.
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Whirlpool
Whirlpool
The Caicos Islands in the northern Caribbean are a popular tourist attraction, renowned for their beautiful beaches, clear waters, scuba diving, and luxury resorts. The islands lie primarily along the northern perimeter of the submerged Caicos Bank (turquoise), a shallow limestone platform formed of sand, algae, and coral reefs covering 2,370 square miles (6,140 square kilometers). Image taken by Landsat 7 on April 24, 2003.
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CARIBBEAN LUXURY: The Caico...
Caribbean luxury
This photo, taken on January 22, 2001 by the Landsat-7 satellite, shows Akpatok Island, which lies in Ungava Bay in Canada. Accessible only by air, Akpatok Island rises out of the water as sheer cliffs that soar 500 to 800 feet (150 to 243 meters) above the sea surface. The island is an important sanctuary for cliff-nesting seabirds. Numerous ice floes around the island attract walruses and whales, making Akpatok a traditional hunting ground for native Inuit people.
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Akpatok Island
Akpatok Island
Perhaps the most impressive of cloud formations, cumulonimbus (from the Latin for “pile” and “rain cloud”) clouds form due to vigorous convection (rising and overturning) of warm, moist and unstable air. Surface air is warmed by the sun-heated ground surface and rises; if sufficient atmospheric moisture is present, water droplets will condense as the air mass encounters cooler air at higher altitudes. The air mass itself also expands and cools as it rises due to decreasing atmospheric pressure, a process known as adiabatic cooling. This type of convection is common in tropical latitudes year-round and during the summer season at higher latitudes. As water in the rising air mass condenses and changes from a gas to a liquid state, it releases energy to its surroundings, further heating the surrounding air and leading to more convection and rising of the cloud mass to higher altitudes. This leads to the characteristic vertical “towers” associated with cumulonimbus clouds, an excellent example of which is visible in this astronaut photograph. If enough moisture is present to condense and heat the cloud mass through several convective cycles, a tower can rise to altitudes of approximately 10 kilometers at high latitudes and to 20 kilometers in the tropics before encountering a region of the atmosphere known as the tropopause—the boundary between the troposphere and the stratosphere. The tropopause is characterized by a strong temperature inversion. Beyond the tropopause, the air no longer gets colder as altitude increases. The tropopause halts further upward motion of the cloud mass. The cloud tops flatten and spread into an anvil shape, as illustrated by this astronaut photograph. The photo was taken from a viewpoint that was at an angle from the vertical, rather than looking straight down towards the Earth’s surface. The image, taken while the International Space Station was located over western Africa near the Senegal-Mali border, shows a fully formed anvil cloud with numerous smaller cumulonimbus towers rising near it. The high energy levels of these storm systems typically make them hazardous due to associated heavy precipitation, lightning, high wind speeds and possible tornadoes.
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Cumulonimbus cloud over Africa
Cumulonimbus cloud over Africa
The Sierra de Velasco Mountains dominate this image in northern Argentina. The Catamarca province is in the northern part of the image, and the La Rioja province is to the south. The streams are fed by runoff from the snow in the Andes Mountains to the north. These intermittent streams can dry up rapidly. The larger urban area near the bottom of the image is La Rioja, the capital of the province of La Rioja. This image was acquired by the Landsat 5 satellite on February 28, 1985.
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Argentina
Argentina
This image, showing tidal flats and channels on Long Island, in the Bahamas, was taken by an Expedition 26 crew member onboard the International Space Station. The islands of the Bahamas in the Caribbean Sea are situated on large platforms made mainly from carbonate sediments ringed by fringing reefs — the islands themselves are only the parts of the platform currently exposed above sea level. The sediments are formed mostly from the skeletal remains of organisms settling to the sea floor; over geologic time, these sediments will consolidate to form carbonate sedimentary rocks such as limestone. Darker blue shows deeper water, while light blue-green shows shallow water on the tidal flat. The continually exposed parts of the island are seen in brown, a result of soil formation and vegetation growth (left).
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This image, showing tidal f...
Long Island, Bahamas
From NASA's Operation IceBridge campaign in Alaska: A high altitude view of Icy Bay, in the Wrangell-Saint Elias Wilderness. Just a century ago, this body of water was covered in ice.
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Icy Bay, Alaska
Icy Bay, Alaska

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