False-Color Image of Earth Highlights Plant Growth
NASA – On Aug. 3, 2004, NASA’s Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) spacecraft began a seven-year journey, spiraling through the inner solar system to Mercury. One year after launch, the spacecraft zipped around Earth, getting an orbit correction from Earth’s gravity and getting a chance to test its instruments by observing its home planet.
This image is a view of South America and portions of North America and Africa from the Mercury Dual Imaging System’s wide-angle camera aboard MESSENGER. The wide-angle camera records light at eleven different wavelengths, including visible and infrared light. Combining blue, red, and green light results in a true-color image from the observations. The image substitutes infrared light for blue light in the three-band combination. The resulting image is crisper than the natural color version because our atmosphere scatters blue light. Infrared light, however, passes through the atmosphere with relatively little scattering and allows a clearer view. That wavelength substitution makes plants appear red. Why? Plants reflect near-infrared light more strongly than either red or green, and in this band combination, near-infrared is assigned to look red.
Apart from getting a clearer image, the substitution reveals more information than natural color. Healthy plants reflect more near-infrared light than stressed plants, so bright red indicates dense, growing foliage. For this reason, biologists and ecologists occasionally use infrared cameras to photograph forests.
> Read more: Why is that Forest Red and that Cloud Blue? How to Interpret a False-Color Satellite Image
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Caption: Holli Riebeek
Uncharted: Big Data as a Lens on Human Culture, Authors: Erez Aiden and Jean-Baptiste Michel.
By Maria Popova – Big data doesn’t comply with the basic premise of the scientific method — rather than eventuating causal relationships borne out of pre-existing hypotheses, it presents a seemingly bottomless pit of correlations awaiting discovery, often through the combination of doggedness and serendipity, an approach diametrically opposed to hypothesis-driven research.
But that, arguably, is exactly what makes big data so alluring — as Stuart Firestein has argued in his fantastic case for why ignorance rather than certitude drives science, modern science could use what the scientific establishment so readily dismisses as “curiosity-driven research” — exploratory, hypothesis-free investigations of processes, relationships, and phenomena. more> http://tinyurl.com/mb2ghss
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By David L. Chandler – A conventional silicon-based solar cell “doesn’t take advantage of all the photons,” Evelyn Wang explains. That’s because converting the energy of a photon into electricity requires that the photon’s energy level match that of a characteristic of the photovoltaic (PV) material called a bandgap. Silicon’s bandgap responds to many wavelengths of light, but misses many others.
The design of the two-layer absorber-emitter material is key to this improvement. Its outer layer, facing the sunlight, is an array of multi-walled carbon nanotubes, which very efficiently absorbs the light’s energy and turns it to heat. This layer is bonded tightly to a layer of a photonic crystal, which is precisely engineered so that when it is heated by the attached layer of nanotubes, it “glows” with light whose peak intensity is mostly above the bandgap of the adjacent PV, ensuring that most of the energy collected by the absorber is then turned into electricity. more> http://tinyurl.com/la28mm7
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By Jeff Green and Keith Naughton – Peak Car is at odds with the ambitious expansion plans of global automakers, which IHS says are gearing up to produce more than 120 million vehicles by 2016 — almost 50 percent more than last year’s worldwide sales mark of 82 million. The dynamic also threatens the business plans of parts producers, suppliers of raw material and oil companies.
Driving this upheaval is a rapidly emerging reality: The vehicle that ushered in an unparalleled era of personal mobility in the last century is, in many cases, no longer the most convenient conveyance, particularly as more of the world’s population migrates to big cities. more> http://tinyurl.com/pbr55zh
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Martian Sand Dunes in Spring
NASA – Mars’ northern-most sand dunes are beginning to emerge from their winter cover of seasonal carbon dioxide (dry) ice. Dark, bare south-facing slopes are soaking up the warmth of the sun.
The steep lee sides of the dunes are also ice-free along the crest, allowing sand to slide down the dune. Dark splotches are places where ice cracked earlier in spring, releasing sand. Soon the dunes will be completely bare and all signs of spring activity will be gone.
This image was acquired by the HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter on Jan. 16, 2014. The University of Arizona, Tucson, operates the HiRISE camera, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project for the NASA Science Mission Directorate, Washington.
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Image Credit: NASA/JPL-Caltech/Univ. of Arizona
Caption: Candy Hansen