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from article Milky Way Galaxy
The Milky Way as seen from the Atacama Desert in Chile at an altitude of around 3,650 m (12,000 ft), with large cacti silhouetted in the foreground. (Credit: ESO/S. Guisard )
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Image
from article Milky Way Galaxy
An artist’s impression of the Milky Way Galaxy as seen from above and with the approximate location of the Sun labeled. [Credit: NASA/JPL-Caltech/R. Hurt (SSC)]
Image
from article Milky Way Galaxy
Infrared image of the Milky Way as seen from the location of the Sun, made from the 2MASS infrared sky survey. The image shows both the bulge and the disk of the Milky Way. Absorption by dust is minimized in the infrared, which accounts for the…
Image
from article Milky Way Galaxy
NGC 4603, a galaxy with a gross morphology similar to the Milky Way, seen obliquely. The spiral arms and the bulge are visible in the center. The bulge appears to be elongated because the galaxy also contains a bar, an extended feature containing…
Image
from article Milky Way Galaxy
A combination of X-ray and radio emission data from the core of the Milky Way, revealing the three-armed “minispiral” structure, with Sagittarius A* labeled, as well as other features including a jet blasted out by the supermassive black hole.…
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from article Virgo Cluster
Distribution of members of the Virgo Cluster on the sky, as determined in the du Pont Telescope survey. (After O.-G. Richter and B. Binggeli, eds., The Virgo Cluster, European Southern Observatory, 1985)
Image
from article Virgo Cluster
Central area of the Virgo Cluster, showing some of its brightest galaxy members. (Canada-France-Hawaii Telescope image courtesy of C. Cuillandre)
Image
from article Virgo Cluster
X-ray image of the entire Virgo Cluster. The main blob is centered on the giant active galaxy M87 (see Fig. 4). (Image from Roentgen Satellite (ROSAT) courtesy of NASA)
Image
from article Virgo Cluster
Giant elliptical galaxy M87. It is one of the brightest galaxies in the Virgo Cluster and is notable for its extremely massive central black hole. (Canada-France-Hawaii Telescope image courtesy of C. Cuillandre)
Image
from article Virgo Cluster
Sombrero Galaxy in an image obtained with the Spitzer Space Telescope. The spheroidal galaxy of stars hosts a thin, spiral-shaped ring of dust, visible in the infrared because of the light emission from the warm dust grains. (NASA/Spitzer Science…
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from article Forest ecosystem
Forest in Moran State Park on Orcas Island, Washington. (Credit: Chris Willig)
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from article Forest ecosystem
Forest fire in No Name Creek area of Colorado. (Credit: Andrea Booher/FEMA)
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from article Forest ecosystem
Puma and cub in forest. (Credit: Grant Faint/Stockbyte/Getty Images)
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from article Forest ecosystem
Conceptual model of elemental cycling in a terrestial ecosystem, emphasizing the presence and activities of arthropod consumers. The indirect regulation of elemental movement by arthropods is indicated by the hourglass-shaped valves on these flows.…
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from article Forest ecosystem
The southern pine beetle (Dendroctonus frontalis) is a destructive insect pest of coniferous forests in the southern United States. (Credit: U.S. Forest Service)
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from article Forest ecosystem
Belowground food web. (Credit: Elaine Ingham)
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from article Polymer composite
Relation between stiffness and filler type and orientation in polymeric materials. L/D = length/diameter of fiber.
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from article Polymer composite
Load transfer from matrix to fiber in a composite. LC = critical length. σma = matrix stress.
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from article Polymer composite
Tensile modulus for various fibers.
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from article Polymer composite
Unidirectional continuous fiber–reinforced laminated structure. L = longitudinal direction. T = transverse direction.
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from article Polymer composite
Measured and predicted elastic modulus in a unidirectional fiber–reinforced laminate as a function of angle between the loading and fiber direction.
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from article Pluto
An enhanced-color global view of Pluto taken by the New Horizons spacecraft on July 14, 2015, showing Pluto's diversity in surface texture and composition. The image (which actually is a mosaic of four images) resolves details on scales as small as…
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from article Pluto
Pluto and its five known moons, imaged by the Hubble Space Telescope on July 7, 2012. (Credit: NASA/ESA/Mark R. Showalter, SETI Institute)
Image
from article Pluto
A perspective view of the orbit of Pluto showing the inclination i and eccentricity of the orbit. The orbits of Jupiter, Saturn, Uranus, and Neptune are also shown. Terms: A, aphelion; P, perihelion; NN′, line of nodes. (Credit: Based on an original…
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from article Pluto
Two views of Pluto's vast nitrogen ice plain known as Sputnik Planitia. (Left) An enhanced-color close-up section of the glacial plains in the middle of Sputnik Planitia. (Right) A "scattering map" of the same region, created by combining two images…
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from article Pluto
Charon, pictured by New Horizons. (Credit: NASA/JHUAPL/SwRI)
Image
from article Branched polymer
Examples of branched polymers. (a) Branched polymer (if arms are of composition similar to backbone) or graft polymer (if compositions are different). (b) Star polymer. (c) Comb polymer. (d) Dendritic polymer.
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from article Branched polymer
Reaction for preparation of a star polymer with styrene-butadiene block copolymer arms.
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from article Branched polymer
Steps in the synthesis of a starburst polymer. s = surface. o = interior. fr = reactive group. fp = protected group.
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from article Tangent
Line L tangent to curve C at P.
Image
from article Herbig-Haro objects
Jet and bow-shock emission from Herbig-Haro 34. Two opposite jets run into the surrounding interstellar medium, where they terminate in Herbig-Haro objects with a characteristic bow-shock structure. The jets are composed of “bullets” of dense gas…
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from article Herbig-Haro objects
Spitzer Space Telescope infrared image and an optical Digital Sky Survey image of Herbig-Haro objects 46 and 47. The inset at the bottom left shows the optical image of the cloud in which the protostar is born and the associated Herbig-Haro objects…
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from article Herbig-Haro objects
Disk and jets associated with Herbig-Haro 30, showing changes between images taken in (a) 1995, (b) 1998 and (c) 2000 with the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. A slightly flared disk of dust and gas appears…
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from article Heterocyclic polymer
Structural units in linear polymers. (a) Simple linear polymer. (b) Stepladder polymer. (c) Ladder polymer.
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from article Heterocyclic polymer
Image
from article Intermolecular force
Schematic diagram of intermolecular interaction. (a) There is negligible interaction between atoms that are 1 nm apart. (b) For atoms separated by about 0.8 nm or less, attractive dispersion forces result from correlated fluctuations of the electron…
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from article Beef cattle production
Angus bull with overall carcass merit. (Credit: Jim Koch/Agricultural Research Service, U.S. Department of Agriculture)
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from article Beef cattle production
Brahman (zebu) bull (Bos indicus). (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
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from article Beef cattle production
An exemplary purebred Hereford bull. (Credit: Michael MacNeil/Agricultural Research Service, U.S. Department of Agriculture)
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from article Beef cattle production
A group of Simmental cows. (Credit: Iowa Beef Industry Council)
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from article Beef cattle production
Three Charolais heifers. (Credit: Darcy Vial/Farm Service Agency, U.S. Department of Agriculture)
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from article Beef cattle production
In order to attain market weight, cattle are fed often in feedlots. (Credit: Dave Hughes/Getty Images)
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from article Beef cattle production
In the United States, beef animals used for food must be inspected extensively pre- and postmortem by federal officials. (Credit: Bob Nichols/U.S. Department of Agriculture)
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from article Fruit, tree
Apple trees growing in an orchard. (Photo by Charles Rondeau)
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from article Fruit, tree
Apple scab on fruit. This disease, caused by the fungus Venturia inaequalis, leads to unsightly blemishes on ripe apples. (Photo courtesy of the University of Georgia Plant Pathology Archive)
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from article Fruit, tree
Brown rot, caused by the fungus Monilinia fructicola, on a peach. (Photo by Jonas Janner Hamann, Universidade Federal de Santa Maria, Brazil)
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from article Fruit, tree
Fire blight, caused by the bacterium Erwinia amylovora, on apple fruits and leaves. (Photo courtesy of the University of Georgia Plant Pathology Archive)
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from article Fruit, tree
Blue mold (Penicillium italicum) on a rotting orange. (Photo by G. L. Barron)
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from article Belladonna
Close-up view of the belladonna plant (Atropa belladonna), showing the leaves and berries, which are toxic. (Credit: Leo Michels)
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from article Nitrogen oxides
Nitrogen-oxide structures. Blue = nitrogen. Red = oxygen.
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from article Lychee
Fruit and leaves of lychee (Litchi chinensis). (Photo courtesy of Forest and Kim Starr)
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from article Earth
The famous "Blue Marble" picture of Earth taken by astronauts during the Apollo 17 mission on December 7, 1972, while en route to the Moon. (Credit: NASA)
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from article Earth
Principal layers of Earth. (USGS)
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from article Earth
Global histogram (distribution of elevations) and hypsographic curve (cumulative elevations) of Earth's surface. (NOAA)
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from article Earth
Seafloor spreading. (USGS)
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from article Earth
Plate collisions: (a) continent-ocean plate collision; (b) continent-continent plate collision; (c) ocean-ocean plate collision. (USGS)
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from article Earth
Structure of the atmosphere. The log scale applies only to the ionization curve. 1 km = 0.6 mi; °F = (°C × 1.8) + 32.
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from article Star tracker
Strapdown satellite star tracker. (a) Mounting of system on the satellite. (b) Star tracker in housing. (Northrop Grumman Corp.)
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from article Star tracker
Silicon focal-plane arrays. (Northrop Grumman Corp.)
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from article Nerve agent
Chemical structure of the nerve agent tabun (GA), C5H11N2O2P.
Image
from article Nerve agent
An example of hazardous materials workers wearing personal protective equipment (PPE), as might be worn to protect against nerve agent exposure. (Credit: CDC Public Health Image Library)
Image
from article Nerve agent
A practice exercise at the Centers for Disease Control and Prevention showing responders using a decontamination station, as might be used after a nerve agent incident. (Credit: CDC Public Health Image Library/Kathy Nellis Chastney)
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from article Nerve agent
Example of auto-injector syringes for atropine and pralidoxime, two antidotes for nerve agent exposure, from a Mark 1 Nerve Agent Antidote Kit (NAAK). (Credit: ATSDR/CDC)
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from article Centaurus
Modern boundaries of the constellation Centaurus, the Centaur. The celestial equator is 0° of declination, which corresponds to celestial latitude. Right ascension corresponds to celestial longitude, with each hour of right ascension representing…
Image
from article Astronomical imaging
Cross-sectional view of the physical structure of an MOS capacitor. Positive voltage (usually a few volts) applied to the metal layer creates a depletion region in the semiconductor.
Image
from article Astronomical imaging
CCD components and readout. (a) Accumulated photoelectrons in a 3 × 3 array of capacitors. Reading the array: (b) The bottom row shifts into the serial register; all remaining rows shift down by one pixel in the parallel register. (c–e) Serial…
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from article Astronomical imaging
Gate structure in a three-phase buried-channel CCD. (a) Two pixels, in cross section. (b) Electron potential pn junction. Collection and barrier potentials on the gates isolate the pixels from each other during an exposure. Overlapping gates produce…
Image
from article Astronomical imaging
Large CCD strategies. (a) Large monolithic detector with multiple serial registers and amplifiers (four, in this case). Read time is reduced by a factor equal to the number of amplifiers, and total charge transfer efficiency (CTE) is improved. (b)…
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from article Hyperbola
Hyperbola as a conic section.
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from article Hyperbola
Hyperbola as a locus of points.
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from article Alicyclic hydrocarbon
Internal bond angles (α) for (a–c) planar rings and (d) a tetrahedral carbon atom.
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from article Alicyclic hydrocarbon
Nonplanar (a) chair and (b) boat structures of cyclohexane.
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from article Alcohol
Ethanol production plant. (Credit: Julie Kendall/Getty Images)
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from article Alcohol
E85 is a gasoline-ethanol blend containing 51 to 83% ethanol. It is used in flexible-fuel vehicles, which can operate on gasoline or blends of gasoline and ethanol. About 20 million flexible-fuel vehicles are operating in the United States. (Credit:…
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from article Fluids
Probability of finding molecular centers at various separations in gases, liquids, and solids.
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from article Fluids
Conditions of pure-component phase behavior.
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from article Fluids
Behavior of pure-component pressures with density at various temperatures.
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from article Fluids
Behavior of pure-component compressibility factors with pressure at various temperatures.
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from article Physical science
An astronaut conducts a physical science experiment aboard the International Space Station involving buoyancy-driven convection and sedimentation, which as force-dependent phenomena occur differently in a microgravity environment. (Credit: NASA)
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from article Model theory
A cutaway model of the Earth's crust under the Bay Area of California, showing various fault lines (such as the San Andreas Fault), and depicting the hypocenter of the devastating 1906 earthquake.
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from article Model theory
Conceptual model of a system.
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from article Model theory
Model of a regional population system.
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from article Biosynthesis
Biosynthetic relationships of some natural products. Specific examples which belong to the various classes are given in brackets.
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from article Thulium
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from article Chemistry
Periodic table. (Jaap Hart/Getty Images)
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from article Magellanic Clouds
Large Magellanic Cloud; the large red patch is the 30 Doradus nebula, one of the largest H II regions known. (Copyright © Australian Astronomical Observatory; photograph by David Malin from AAT plates)
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from article Magellanic Clouds
Small Magellanic Cloud. This image is composed from two images of the Digitized Sky Survey 2. (ESA/Hubble; Digitized Sky Survey 2)
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from article Magellanic Clouds
Large Magellanic Cloud. (Harvard Observatory photograph by P. Hodge)
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from article Magellanic Clouds
Giant gas cloud centered on 30 Doradus in the Large Magellanic Cloud. (Cerro Tololo Inter-American Observatory photograph by P. Hodge)
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from article Mercury (element)
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from article Mercury (element)
Mercury droplets exhibiting non-wetting of the surface. (Credit: A. Cerar/Getty Images)
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from article Mercury (element)
Tooth with a silver-amalgam filling. (Credit: Szasz-Fabian Jozsef/Shutterstock.com)
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from article Bluegrass
Kentucky bluegrass (Poa pratensis). (Photo courtesy of Forest and Kim Starr)
Image
from article Universe
An image from a computer simulation of large-scale structure formation in the universe, with vast filaments of relatively dense matter separated by even larger voids with low matter density. Each dot indicates an individual galaxy. (Credit: Max…
Image
from article Universe
The Hertzsprung-Russell (HR) diagram, which plots stars' temperatures (x axis) against their luminosities (y axis). Numerous examples of stars in the Milky Way are included in this sample diagram. (Credit: ESO)
Image
from article Universe
A mosaic of the central star-forming region of the Orion Nebula, otherwise known as M42. Here the emission from young stars (pointlike sources) lights up the surrounding gas, mostly composed of hydrogen atoms. (Credit: C. R. O'Dell and S. K. Wong,…
Image
from article Universe
The Hubble Ultra Deep Field. The image represents a nearly 12-day exposure of a small patch of sky, about a tenth of the diameter of the full Moon, that is “empty” to the naked eye from Earth. Taken by the Advanced Camera for Surveys (ACS; optical)…
Image
from article Universe
Galaxies. (a) Spiral galaxy M81 (NGC 3031). The flat disk, spiral arms, and central bulge are visible. The spherical halo that surrounds both is too sparsely populated to be evident (Credit: NASA, ESA, JPL-Caltech, Harvard-Smithsonian Center for…
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from article Universe
Heart of the Virgo Cluster, the nearest moderately rich cluster of galaxies, including the giant elliptical galaxies M84, M86, and M87. (Credit: Anglo-Australian Observatory; photograph by David Malin)
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from article Universe
The Sloan Digital Sky Survey's map of the universe, compiled via redshift surveys. Each dot represents a galaxy, while a color bar represents local density. (Credit: SDSS)
