A(01 of26)
Open Image Modal"An astronaut captured this photograph of Utah’s Green River doubling back on itself—a feature known as Bowknot Bend—from the International Space Station on January 22, 2014." NASA
B(02 of26)
Open Image Modal"On August 4, 2014, the Operational Land Imager (OLI) on Landsat 8 acquired this image of the Arkansas River and the Holla Bend Wildlife Refuge. In the winter, it is common for the refuge to host 100,000 ducks and geese at once." NASA
C(03 of26)
Open Image Modal"An astronaut captured this photograph of an artificial island at the southern end of Bahrain Island on January 23, 2011. The beach sand on tropical islands is mostly made up of calcium carbonate from the shells and skeletons of marine organisms." NASA
D(04 of26)
Open Image Modal"The Akimiski Island in James Bay on August 9, 2000." NASA
E(05 of26)
Open Image Modal"On October 25, 2009, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this image of a phytoplankton bloom off the coast of New Zealand." -NASA
F(06 of26)
Open Image Modal"The Operational Land Imager (OLI) on Landsat 8 acquired this false-color image of valleys and snow-covered mountain ranges in southeastern Tibet on August 4, 2014. Firn is a granular type of snow often found on the surface of a glacier before it has been compressed into ice." NASA
G(07 of26)
Open Image Modal"This image of Pinaki Island was captured by astronauts on the International Space Station in April 2001." NASA
H(08 of26)
Open Image Modal"On, August 30, 2014, the Operational Land Imager on Landsat 8 acquired this image of rivers running through colorful ridges in southwestern Kyrgyzstan." NASA
I(09 of26)
Open Image Modal"On February 10, 2007, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this image of the Andaman Islands. The thin, bright rings surrounding several of the islands are coral reefs that were lifted up by a massive earthquake near Sumatra in 2004." NASA
J(10 of26)
Open Image Modal"On July 17, 2015, the Operational Land Imager on Landsat 8 captured this image of the Trunk Reef near Townsville, Australia." NASA
K(11 of26)
Open Image Modal"On August 3, 2015, the Operational Land Imager (OLI) on Landsat 8 acquired this image of glaciers at the Sirmilik National Park Pond Inlet in Mittimatalik, Canada." NASA
L(12 of26)
Open Image Modal"On October 30, 2008, the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite captured this image of snow across the northeastern United States." NASA
M(13 of26)
Open Image Modal"On August 14, 2015, the Operational Land Imager (OLI) on Landsat 8 captured this image of glaciers in the Tian Shan mountains in northeastern Kyrgyzstan. " NASA
N(14 of26)
Open Image Modal"On March 4, 2009, the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite captured this image of ship tracks over the Pacific. Ship emissions contain small particles that cause the clouds to form." NASA
O(15 of26)
Open Image Modal"On January 24, 2008, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on the Terra satellite captured this image of Tenoumer meteorite crater in Mauritania. The meteorite struck Earth between 10,000 and 30,000 years ago." NASA
P(16 of26)
Open Image Modal"On August 4, 2005, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensor on the Terra satellite captured this false-color image of the Mackenzie River Delta in Canada." NASA
Q(17 of26)
Open Image Modal"On November 29, 2004, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite acquired this image of Lonar Crater in India." NASA
R(18 of26)
Open Image Modal"On January 20, 2015, the Operational Land Imager (OLI) on Landsat 8 captured this image of Lago Menendez in Argentina." NASA
S(19 of26)
Open Image Modal"On April 29, 2009, the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite acquired this image of clouds swirling over the Atlantic Ocean." NASA
T(20 of26)
Open Image Modal"On March 9, 2015, the Operational Land Imager (OLI) on Landsat 8 captured this image of development along two roads in the United Arab Emirates." NASA
U(21 of26)
Open Image Modal"On May 9, 2004, the Ikonos satellite captured this image of Gooseneck State Park in Utah." NASA
V(22 of26)
Open Image Modal"On March 23, 2015, the Operational Land Imager (OLI) on Landsat 8 acquired this image of ash on the snow around Shiveluch—one of the largest and most active volcanoes on Russia’s Kamchatka Peninsula." NASA
W(23 of26)
Open Image Modal"On January 13, 2009, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this image of dust blowing over the Red Sea."
X(24 of26)
Open Image Modal"On August 7, 2012, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite captured this false-color image of the northwest corner of Leidy Glacier in Greenland." NASA
Y(25 of26)
Open Image Modal"On December 25, 2000, by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite captured this false-color image of the Ugab River in Namibia." NASA
Z(26 of26)
Open Image Modal"On July 11, 2012, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this image of wildfire smoke over Canada." NASA