Astronaut Photography

Erg Oriental, Algeria
Image

Erg Oriental, Algeria

Published Feb 12, 2007

Image of the Day Land

Mumbai, India
Image

Mumbai, India

Mumbai is a megacity, one whose population is more than 10 million. More than 21 million people live in the greater Mumbai metropolitan region.

Published Feb 5, 2007

Image of the Day Land

The Top of the Atmosphere
Image

The Top of the Atmosphere

Atmospheric gases scatter blue wavelengths of visible light more than other wavelengths, giving the Earth’s visible edge a blue halo. At higher and higher altitudes, the atmosphere becomes so thin that it essentially ceases to exist. Gradually, the atmospheric halo fades into the blackness of space. This astronaut photograph captured on July 20, 2006, shows a nearly translucent moon emerging from behind the halo.

Published Feb 2, 2007

Image of the Day Atmosphere

Pagan Island, Northern Mariana Islands
Image

Pagan Island, Northern Mariana Islands

Pagan Island (image right) is made up of two volcanoes connected by a narrow isthmus of land. The volcanoes are stratovolcanoes, which are tall, typically cone-shaped structures formed by layers of dense, crystallized lava and less-dense ash and pumice. Mount Pagan, the larger of the two volcanoes, forms the northeastern portion of the island and has been the most active historically.

Published Jan 29, 2007

Image of the Day Atmosphere Land Water

The East Pacific Rise from Near and Far
Image

The East Pacific Rise from Near and Far

What do oceanographers and astronauts have in common? Observations of the complex interactions between different Earth systems, for one. Astronauts aboard the International Space Station routinely observe and photograph the Earth’s surface to visualize the complicated interfaces between the atmosphere, the ocean, the land, and life on the surface. Oceanographers are also interdisciplinary students of the Earth; their interests include geology, chemistry, hydrology, and biology. Currently, a team of scientists is cruising the eastern Pacific Ocean off the coast of Mexico and is preparing for submersible dives on the East Pacific Rise, part of the world’s mid-ocean ridge system.

Published Jan 23, 2007

Image of the Day Water

Gallipoli and Dardanelles Strait, Turkey
Image

Gallipoli and Dardanelles Strait, Turkey

The city of Gallipoli sits at a crossroads between the Marmara and Aegean Seas, connected by the Dardanelles Strait. he urbanized area of modern Gallipoli is visible as a light gray to pink region at the entrance to the Dardanelles Strait.

Published Jan 22, 2007

Image of the Day Land Water

New Orleans and Lake Pontchartrain
Image

New Orleans and Lake Pontchartrain

In this astronaut photograph from November 16, 2006, sunglint—light reflected directly back to the camera onboard the International Space Station (ISS) from a water surface—accentuates the wetland setting of New Orleans by highlighting the numerous lakes, ponds, and rivers (in various shades of silver-gray) surrounding the city.

Published Jan 15, 2007

Image of the Day Land Life

Gibraltar Bay, Western Mediterranean Sea
Image

Gibraltar Bay, Western Mediterranean Sea

Gibraltar Bay, located near the southernmost tip of the Iberian Peninsula, is the central feature of this astronaut photograph. The famous Rock of Gibraltar that forms the northeastern border of the bay is formed of Jurassic-era seafloor sediments that solidified into limestone, a rock formed mostly of the mineral calcite, which is found in the shells of sea creatures. The limestone was subsequently lifted above the ocean surface when the African and Eurasian tectonic plates collided. The cities of La Linea and Algeciras bordering the bay, together with petroleum-processing facilities along the northern shoreline, are part of Spain, whereas the city of Gibraltar itself (to the west of and including the Rock) is under the jurisdiction of the United Kingdom.

Published Jan 8, 2007

Image of the Day Land Water

Dyess Air Force Base: Abilene, Texas
Image

Dyess Air Force Base: Abilene, Texas

Dyess Air Force Base, located near the central Texas city of Abilene, is the home of the 7thBomb Wing and 317th Airlift Groups of the United States Air Force. The main runway is approximately 5 kilometers long, a distance that is necessary to accommodate the large bombers and cargo aircraft at the base. Many of these aircraft are visible in the image, parked in parallel rows on the base tarmac.

Published Jan 1, 2007

Image of the Day Land Life

Geneva, Switzerland
Image

Geneva, Switzerland

The city of Geneva embraces the southern end of Lake Geneva (also known as Lac Léman). Geneva is tucked between two major mountain ranges, the Jura to the northwest (not shown) and the Alps to the southeast. Mount Saleve, near the bottom of the image, represents the northern foothills of the range.

Published Dec 25, 2006

Image of the Day Land Life

Lake Morari, Tibet
Image

Lake Morari, Tibet

Meltwater from glaciers to the east and west drains into Lake Morari, a large lake that lies at an altitude of 4,521 meters (14,830 feet) on the Tibetan Plateau. A stream on the west side provides the lake’s main inflow. Mud from this river gives the light blue hues to the lake water. The well-formed alluvial fan (image center), built by sediment from the main inflow river, is the reason the lake has formed at this point in the valley.

Published Dec 18, 2006

Image of the Day Land

Bernese Alps, Switzerland
Image

Bernese Alps, Switzerland

The formidable mountain system of the Alps stretches across much of central Europe, with seven countries claiming portions of the mountains within their borders: Germany, France, Switzerland, Italy, Liechtenstein, Austria, and Slovenia. The glacial landscape of the Bernese Alps, located in southwestern Switzerland, is well illustrated by this astronaut photograph. An astronaut took this picture looking north-northwest while the International Space Station was over the Mediterranean Sea between Corsica and Italy. Three of the higher peaks of the central Alps are visible: Jungfrau at 4,158 meters (13,642 feet); Moench at 4,089 meters (13,415 feet); and Eiger at 3,970 meters (13,025 feet).

Published Dec 11, 2006

Image of the Day Land

Rio Negro, Amazonia, Brazil
Image

Rio Negro, Amazonia, Brazil

The wide, multi-island zone in the Rio Negro (Black River) shown in this astronaut photograph from September 2, 2006, is one of two, long “archipelagoes” upstream of the city of Manaus (not shown) in central Amazonia. Sixty kilometers of the total 120-kilemeter length of this archipelago appear in this image.

Published Dec 4, 2006

Image of the Day Land

Galveston, Texas
Image

Galveston, Texas

Galveston Island has alternately been a home to Native Americans, a base for Mexico’s rebellion against Spain, a pirate kingdom, a sea port, and even the capital of the Republic of Texas. In September 1900, the city was largely destroyed by a powerful hurricane. This storm damage, combined with construction of the Houston Ship Channel and discovery of oil in eastern Texas, shifted the center of trade northwest to Houston. This astronaut photograph shows some of the human impacts in Galveston that are easily observed from the vantage point of low-Earth orbit. The city of Galveston dominates the eastern half of Galveston Island, appearing as the gray-white region at center right. A large seawall along the Gulf of Mexico—shown here along the southern coastline of Galveston Island—protects most of the city. To the west of Galveston, coastal wetlands are largely submerged by regional subsidence—sinking of the land as a result of ground water withdrawal by the petrochemical industry of Houston and Texas City.

Published Nov 27, 2006

Image of the Day Land Water

Currituck Sound, North Carolina, USA
Image

Currituck Sound, North Carolina, USA

North Carolina’s Outer Banks—known as Pine Island in the area shown in this image—protects a network of interconnected waterways, including Currituck Sound, a shallow, 3-mile-wide water body; the North River; and the well-known Albemarle Sound. Wakes from barges on the Intracoastal Waterway appear on the North River, which provides a connection between the Hampton Roads area to the north and Pamlico Sound to the south.

Published Nov 20, 2006

Image of the Day Land Water

Berkeley Pit: Butte, Montana
Image

Berkeley Pit: Butte, Montana

Mined for gold, silver, and copper, the region of Butte, Montana, had already earned the nickname of “The Richest Hill on Earth” by the end of the 19th century.

Published Nov 13, 2006

Image of the Day Land

Haze in the Po River Valley, Italy
Image

Haze in the Po River Valley, Italy

Taken from an oblique angle and looking toward the southwest, this astronaut photograph shows parts of northern Italy, Corsica, Sardinia, the Adriatic Sea, and the Mediterranean. Over part of the Alps, skies are clear, but elsewhere, the view of the land and sea is largely obscured. Bright white clouds cover much of the region, but over northern Italy, the “clouds” are different. There, dingy, gray-blue haze hangs over the Po River Valley.

Published Nov 6, 2006

Image of the Day Atmosphere

Aquaculture in the Nile Delta
Image

Aquaculture in the Nile Delta

In the last three decades, Egypt has greatly modified a series of lagoons and lakes along the northeast coast of the Nile Delta for the production of fish. Partial sunglint in this astronaut photograph reveals numerous details in one such fishery. Sunglint is light reflected directly back from a surface—usually water—to the viewer (or to a camera or satellite sensor). Waves generated by northwesterly winds (lower left to upper right in this view) have created the frond-like sand spit along the coast (image top). Faint sea swells are visible at image upper left as a pattern of dark and light lines. Dark patches in the center of the image are shadows cast by small clouds, which appear pewter-gray compared to the golden sunglint on the watery surfaces below.

Published Oct 30, 2006

Image of the Day Life Water

Volga River Delta
Image

Volga River Delta

The Volga River drains much of western Russia’s industrial region as it travels southward to empty into the Caspian Sea. Over thousands of years, the river has built a tremendous delta that forms the northwestern shoreline of the Caspian Sea. The delta channels provide transportation between the heartland of Russia and the oil-rich Caspian Sea. The Volga’s extensive distributaries (branches to the sea) harbor habitat and rich fishing grounds for Russia’s famous beluga sturgeon, the source of beluga caviar. The delta’s wetlands, parts of which are designated as the Astrakhanskiy Biosphere Reserve, are important stopping points and breeding grounds for migrating water birds. This detailed astronaut photograph zooms in on a shipping channel in the western part of the delta.

Published Oct 23, 2006

Image of the Day Land

Sand Dunes in Har Nuur (Black Lake), Western Mongolia
Image

Sand Dunes in Har Nuur (Black Lake), Western Mongolia

Har Nuur (“Black Lake”) is located in western Mongolia’s Valley of Lakes, part of a system of closed basins stretching across central Asia. These basins are the remnants of larger paleolakes (paleo- means “ancient”) that began to shrink approximately five thousand years ago as regional climate became drier. This oblique (looking at an angle) astronaut photograph captures the dynamic nature of the landscape of Har Nuur. The lake is encircled by sand dune fields that encroach on the lower slopes of the Tobhata Mountains to the west and south. Gaps in the mountains have been exploited by sand dunes moving eastward, indicating westerly winds. The most striking example is a series of dunes entering Har Nuur along its southwestern shoreline.

Published Oct 16, 2006

Image of the Day Land Water

Munich International Airport, Germany
Image

Munich International Airport, Germany

The Franz Josef Strauss, or Munich, International Airport served 29 million passengers in 2005, making it Germany’s second-busiest airport, after Frankfurt. This astronaut photograph, taken from the International Space Station, shows enough detail to distinguish individual airplanes on the terminal apron, and the dark gray-blue rooftop of Terminal 2.

Published Oct 9, 2006

Image of the Day Land

Wave Patterns Near Bajo Nuevo Reef, Caribbean Sea
Image

Wave Patterns Near Bajo Nuevo Reef, Caribbean Sea

In these images captured by International Space Station astronauts on August 27, 2006, bright sunlight glinting off the western Caribbean Sea reveals intersecting wave patterns and oily surfactants on the surface waters around Bajo Nuevo Reef. Bajo Nuevo is a collection of small islets arranged into two U-shaped cays, low islands made of coral or sand. This pair of images shows the easternmost of the two cays (also known as “keys”) and surrounding waters.

Published Oct 2, 2006

Image of the Day Water

Day Fire, Southern California
Image

Day Fire, Southern California

The Day Fire started in Los Padres National Forest north of Los Angeles on September 4, 2006. Easterly winds on September 17 blew the smoke westward, out to sea, and International Space Station astronauts observed this wind shift. In this astronaut photograph, the forested mountains north of Los Angeles appear dark green, and the smoke appears gray. Dense farmland appears at the south end of California’s Central Valley, in the upper left corner. Near top center, the western corner of the Mojave Desert is framed by a “V” of mountains. In the Mojave just beyond the top edge of the image (visible in the large version) are dry lakes that appear as white patches; one of these lakes acts as a landing site for the Space Shuttle.

Published Sep 25, 2006

Image of the Day Atmosphere Land

Crater Lake, Oregon
Image

Crater Lake, Oregon

Crater Lake is formed from the caldera of Mount Mazama. Part of the Cascades volcanic chain, Mount Mazama sits between the Three Sisters volcanoes to the north and Mount Shasta to the south. The catastrophic eruption of Mount Mazama that occurred approximately 7,700 years ago destroyed the volcano while simultaneously forming the basin for Crater Lake. Eruptive activity continued in the region for perhaps a few hundred years after the major eruption. Evidence of this activity lingers in volcanic rocks, lava flows, and domes beneath the lake surface; the small cone of Wizard Island is the only visible portion of these younger rocks. Although considered a dormant volcano, Crater Lake is part of the United States Geological Survey Cascades Volcano Observatory seismic monitoring network.

Published Sep 18, 2006

Image of the Day Land

Dune Types in the Issaouane Erg, Eastern Algeria
Image

Dune Types in the Issaouane Erg, Eastern Algeria

One of the main reasons that rainless regions like the Sahara Desert are interesting from the perspective of landscape science is that the work of flowing water—mainly streams and rivers—becomes less important than the work of wind. Over millennia, if enough sand is available, winds can generate dunes of enormous size, arranged in regular patterns. Long, linear dunes stretch generally north to south across much of northeast Algeria, covering a vast tract (~140,000 square kilometers) of the Sahara Desert known as the Erg Oriental. Erg means “dune sea” in Arabic, and the term has been adopted by modern geologists. Spanning this image from a point on the southwest margin of the erg (image center point: 28.9°N 4.8°W) are a series of 2-kilometer-wide linear dunes, comprised of red sand. The dune chains are more than 100 meters high. The “streets” between the dunes are grayer areas free of sand.

Published Sep 11, 2006

Image of the Day Land

Golden Gate, San Francisco, California
Image

Golden Gate, San Francisco, California

The Golden Gate of San Francisco Bay is one of the most recognizable straits in the world due to the Golden Gate Bridge that spans it. This high-resolution astronaut photograph is a nearly cloud-free view of the northern part of the San Francisco metropolitan area.

Published Sep 4, 2006

Image of the Day Water

250,000 Earth Photographs from the International Space Station
Image

250,000 Earth Photographs from the International Space Station

The crew of Expedition 13 recently passed a major milestone: as of late August 2006, more than one quarter of a million images of Earth had been taken from the International Space Station. The 250,000th image is an oblique view (a photograph taken from a side angle) of the city of Christchurch, New Zealand. This view provides a sense of perspective and accents topography, in contrast to nadir (directly downwards) views. Snow highlights the peaks of the Banks Peninsula to the southeast of the city. The peninsula has a radically different landscape compared to the adjoining, flat Canterbury Plains, where Christchurch (gray patch to the north) is located. The Banks Peninsula is formed from the overlapping cones of the extinct Lyttelton and Akaroa volcanoes. Subsequent erosion of the cones formed the heavily dissected terrain visible in the image, and sea level rise led to the creation of several harbors around the Peninsula. Erosion continues unabated today, as evidenced by the apron of greenish blue, sediment-laden waters surrounding the Banks Peninsula.

Published Aug 28, 2006

Image of the Day Land Life

Ash Cloud from Mount Ubinas, Peru
Image

Ash Cloud from Mount Ubinas, Peru

Subduction of the Nazca tectonic plate along the western coast of South America forms the high Peruvian Andes. The subduction (movement of one plate beneath another) also produces magma, feeding a chain of historically active volcanoes along the western front of the mountains. The most active of these volcanoes in Peru is Ubinas. A typical, steep-sided stratovolcano comprised primarily of layers of silica-rich lava flows, it has a summit elevation of 5,672 meters (18,609 feet). At 1.4 kilometers (0.87 miles) across, the volcano’s caldera gives it a truncated profile. Hardened lava flows from past eruptions linger on the volcano’s flanks. This oblique image (looking at an angle) from the International Space Station (ISS) captures an ash cloud first observed on satellite imagery at 11:00 GMT on August 14, 2006. An ISS astronaut took this picture one hour and 45 minutes later.

Published Aug 21, 2006

Image of the Day Heat Land Volcanoes

Mount Etna, Sicily
Image

Mount Etna, Sicily

One of the most consistently active volcanoes in the world, Sicily’s Mount Etna has a historical record of eruptions dating back to 1500 BC. This astronaut photograph captures plumes of steam and possibly ash originating from summit craters on the mountain: the Northeast Crater and Central Crater, which includes two secondary craters (Voragine and Bocca Nuova).

Published Aug 14, 2006

Image of the Day Atmosphere Land Volcanoes

Calcite Quarry, Michigan
Image

Calcite Quarry, Michigan

While the Great Lakes region of North America is well known for its importance to shipping between the United States, Canada, and the Atlantic Ocean, it is also the location of an impressive structure in the continent’s bedrock: the Michigan Basin. Formed during the Paleozoic Era (approximately 540–250 million years ago) the Basin looks much like a large bullseye defined by the arrangement of exposed rock layers that all tilt inwards, forming a huge bowl-shaped structure. The outer layers of the Basin include thick deposits of carbonates—rocks containing carbon and oxygen, such as limestone—deposited over millions of years when a shallow sea covered the region. These carbonate rocks are mined throughout the Great Lakes region using large open-pit mines. The largest carbonate mine in the world, Calcite Quarry, appears in this astronaut photograph.

Published Aug 7, 2006

Image of the Day Land