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from article Octopoda
An octopod swimming in the ocean. (Credit: Getty Images/iStockphoto)
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from article Octopoda
Hapalochlaena maculosa, the Southern or lesser blue-ringed octopus, has vivid, small blue rings on its body and arms, highlighted with black outlines. Location: Mrs. Watson's Bay, Lizard Island, Great Barrier Reef, Australia. (Credit: Clyde F. E.…
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from article Octopoda
Hapalochlaena fasciata, the blue-lined octopus, has vivid blue lines on its body and rings on its arms, highlighted with black outlines. Location: Long Reef, New South Wales, Australia. (Credit: Clyde F. E. Roper)
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from article Octopoda
Lateral view of a female Argonauta (family Argonautidae). (Copyright © McGraw Hill)
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from article Polyplacophora
Chiton on a rock surface. (Photo courtesy of the NOAA Okeanos Explorer Program, National Oceanic and Atmospheric Administration)
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from article Polyplacophora
Polyplacophoran mollusk (chiton): (a) dorsal view; (b) ventral view.
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from article Eclipse
The August 21, 2017 total solar eclipse, as seen from Hopkinsville, Kentucky, USA at 2:25 p.m. EDT. (Credit: NASA)
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from article Eclipse
Circumstances of solar and lunar eclipses (not to scale).
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from article Eclipse
Diamond-ring effect at the beginning of totality during the solar eclipse of July 11, 2010, observed from Easter Island in the middle of the Pacific Ocean. (Credit: Jay M. Pasachoff/Science Faction, Muzhou Lu, and Craig Malamut, Williams College…
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from article Eclipse
Total solar eclipse of July 11, 2010, observed from Easter Island in the Pacific Ocean. (a) Image composited from several exposures using radial filters in order to show a wide dynamic range of intensity of the corona and to bring out the structures…
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from article Eclipse
Solar eclipse of April 8, 2005, observed during totality from a ship in the mid-Pacific Ocean, west of the Galápagos Islands. (Credit: Jay M. Pasachoff and Dava Sobel/Science Faction)
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from article Eclipse
Paths of all total solar eclipses from 2001 through 2025. The point of greatest eclipse is indicated by an asterisk on each eclipse path. (Credit: Eclipse map by Michael Zeiler, www.eclipse-maps.com. Eclipse paths by Xavier Jubier, xjubier.free.fr.)
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from article Eclipse
Cross section through the Earth's shadow cone (umbra) at the Moon's distance, showing the motion of the Moon at three types of lunar eclipses: penumbral eclipse, partial umbral eclipse, and total umbral eclipse.
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from article Eclipse
Stages of the total lunar eclipse of December 21, 2010. (Credit: Glenn Schneider)
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from article Eclipse
Total lunar eclipse of December 9, 1992, which was so dark that it rendered the Moon nearly invisible during totality. (Credit: F. Espenak)
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from article Aconchulinida
Aconchulinida. (a) Penardia cometa. (b) Penardia mutabilis.
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from article Siphonaptera
Head of Spilopsyllus cuniculi (rabbit flea), with extended mouthparts.
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from article Guided missile
GBU-15 with data link system, mounted on F-4 Phantom II fighter. (Hughes Aircraft Co.)
Image
from article Guided missile
TOW (tube-launched, optically tracked, wire-guided) antitank missile and launch tube. Wings and tails fold to permit tube mounting. (Hughes Aircraft Co.)
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from article Guided missile
Launching of a field-mobile, short-range, all-weather surface-to-air Roland missile. The West German–French Roland has been licensed for production in the United States for use as a U.S. Army air defense weapon. (U.S. Army)
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from article Guided missile
F-15 Eagle fighter aircraft equipped with a mixture of short-range, infrared Sidewinder and medium-range, radar Sparrow air-to-air missiles. (McDonnell-Douglas)
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from article Guided missile
Phoenix long-range air-to-air supersonic missile. (a) Side view (Hughes Aircraft Co.). (b) Launch from F-14 fighter aircraft (U.S. Navy).
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from article Guided missile
Falcon air-to-air missile family, including missiles with infrared and radar guidance, and high-explosive and nuclear warheads. (Hughes Aircraft Co.)
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from article Guided missile
Tomahawk long-range, subsonic cruise missile. (a) Side view. (b) Submerged launch. Missile may also be launched from surface or air. (General Dynamics)
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from article Guided missile
Harpoon antiship cruise missile. (a) Ship-launched. (b) Air launch version on A-6 intruder attack aircraft. (McDonnell-Douglas)
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from article Guided missile
Image
from article Planet
An artist’s impression of a mere sampling of the planetary diversity expected to exist in nature. [Credit: C. Pulliam & D. Aguilar (CfA)]
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from article Planet
Plan of the solar system's major and dwarf planets. (a) Solar system out to Neptune. (b) Dwarf planets in the outer solar system (Credit: Emily L. Schaller)
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from article Planet
Orbital elements, which determine the position of a planet in its orbit and the orientation of the orbit in space. Symbols explained in text.
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from article Planet
The interiors of the 8 planets and the dwarf planet Pluto. Mercury, Venus, Earth, and Mars are characterized by dense, metallic cores and lower-density mantles and crusts. Jupiter and Saturn have compositions that mimic the Sun's, though…
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from article Planet
Complex lunar crater Bullialdus, 60 km (37 mi) in diameter, shows terraced sides, a central peak, and a flat bottom. It may be compared to the small (less than 8 km or 5 mi) crater in the foreground, which is simple and bowl-shaped. (Credit: NASA)
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from article Planet
Ultraviolet images from the Hubble Space Telescope, which reveal auroral emission surrounding the north magnetic pole of Jupiter. [Credit: NASA, ESA, and J. Nichols (University of Leicester)]
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from article Atomic bomb
The mushroom cloud over Nagasaki, Japan, after an atomic bomb was dropped by U.S. aircraft on August 9, 1945. (Credit: Everett Historical/Shutterstock)
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from article Atomic bomb
Conceptual diagrams illustrating the main features of (a) implosion type and (b) gun-barrel type of fission weapons. (Credit: A. DeVolpi)
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from article Wilkinson Microwave Anisotropy Probe
Wilkinson Microwave Anisotropy Probe (WMAP) spacecraft. (Courtesy of NASA/WMAP Science Team)
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from article Wilkinson Microwave Anisotropy Probe
WMAP sky-scan strategy. (a) Location of the satellite relative to the Earth and Sun (not to scale), and the orientation of the satellite and of the lines of sight to the spots on the sky focused by the primary reflectors, which continually changed…
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from article Wilkinson Microwave Anisotropy Probe
WMAP full-sky CMB anisotropy map. The microwaves captured in this picture from WMAP are from when the universe was 378,000 years old, over 13 × 109 years ago. It is a “baby picture” of the universe, equivalent to taking a picture of an 80-year-old…
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from article Digenea
Diagrams of various adult types of digenean trematodes. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Digenea
Digenean trematode life cycle. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Ctenothrissiformes
A Cretaceous ctenothrissiform fossil, Ctenothrissa sp. (order Ctenothrissiformes), on a limestone matrix found in Lebanon. Size: 90 mm (3.5 in.). (Photo courtesy of The Virtual Fossil Museum)
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from article Food science
Food scientist examining a tomato. (Credit: Adam Gault/Age Fotostock)
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from article Acari
Parasitiformes body plan. Lateral view of a predatory adult female Mesostigmata showing major body regions and important structures. Scale bar = 0.1 mm (0.004 in.). (Scanning electron micrograph by D. E. Walter)
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from article Acari
Acariformes body plan. (a) Adult female Oribatida (Sarcoptiformes) in lateral view showing major body regions and important structures. (b) Hexapod larva (Trombidiformes): dorsal view of a chigger, a parasite of vertebrates. (c) Octopod deutonymph…
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from article Haplosporida
Spore of Urosporidium fuliginosum.
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from article Haplosporida
Stages in the development of Icthyosporidium giganteum.
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from article Hyperbolic geometry
Examples of simple hyperbolic knots and links. (a) Figure-8 knot. (b) Whitehead link.
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from article Transmission lines
Two common transmission lines for communication. (a) Coaxial cable. (b) Strip line.
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from article Transmission lines
Equivalent circuit that represents three sections of a lossless transmission line. Each section is of length Δz, and has an inductor (L) and capacitor (C). Voltages (V ) and currents (I ), and their differences (ΔV and ΔI ) between successive…
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from article Transmission lines
Signal detection on an oscilloscope. (a) Oscilloscope pictures of voltage pulses at three locations, z1, z2, and z3, on a transmission line, successively more distant from the signal generator. (b) Oscilloscope pictures of a periodic voltage sine…
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from article Transmission lines
Transmission line with characteristic impedance Zc, terminated in a load impedance ZL. A change of coordinate system (from z to ζ) is indicated.
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from article Transmission lines
Envelope of the voltage standing wave consisting of a wave propagating from z = −∞ and being reflected at z = 0. The wavelength, λ, and the maximum and minimum voltages, Vmax and Vmin , are indicated.
Image
from article Transmission lines
Two waveguides, with conventional coordinates. (a) Rectangular waveguide. (b) Cylindrical waveguide.
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from article Transmission lines
Dispersion curve for a rectangular waveguide of width a, showing relationship between the propagation constant, β, and the angular frequency, ω. Here, n specifies the mode of propagation, and c is the speed of light.
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from article Transmission lines
Equivalent circuit of a power transmission line. The single-phase circuit is used to represent balanced three-phase lines. Here, R and X are the resistance and reactance (at the operational frequency), and C is the capacitance of the entire…
Image
from article Urodela
A typical member of the order Urodela: the longtail salamander (Eurycea longicauda). (Credit: Ryan Hagerty/U.S. Fish and Wildlife Service)
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from article Urodela
Southern dwarf siren (Pseudobranchus axanthus), which has undergone limb degeneration and retains only tiny forelimbs. (Credit: U.S. Geological Survey)
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from article Urodela
World distribution of salamanders (order Urodela), indicated by areas of shaded blue color. (Copyright © McGraw Hill)
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from article Urodela
California tiger salamander (Ambystoma californiense). (Credit: John Cleckler/U.S. Fish and Wildlife Service)
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from article Urodela
The two-toed amphiuma salamander (Amphiuma means). (Credit: Southeast Ecological Center, U.S. Geological Survey)
Image
from article Urodela
The northern red salamander (Pseudotriton ruber ruber) is a member of the family Plethodontidae. (Credit: Alicia Lafever/U.S. National Park Service)
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from article Chamois
Alpine chamois (Rupicapra rupicapra). (Photograph courtesy of Brent Huffman/Ultimate Ungulate Images)
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from article Chicxulub impact crater
Bouguer gravity anomaly map over the Chicxulub impact crater. The coastline is designated by a thin white line, cenotes (natural pits) and sinkholes are designated by black dots, and the city of Mérida and the town of Chicxulub Puerto are designated…
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from article Chicxulub impact crater
Seismic line imaging of what lies beneath the seafloor, showing the Chicxulub impact crater. The crater includes many faults that can be grouped into an exterior ring fault, a series of outer ring faults, and a series of inner ring faults. Within…
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from article Amniota
Basic types of vertebrate eggs.
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from article Amniota
Embryo developing in amniote eggs.
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from article Mecoptera
Male scorpion fly (Panorpa), order Mecoptera.
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from article Ursa Minor
Modern boundaries of the constellation Ursa Minor, the Little Bear. The celestial equator is 0° of declination, which corresponds to celestial latitude. Right ascension corresponds to celestial longitude, with each hour of right ascension…
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from article Venus
Venus compared to Earth in size. Note that the image of Venus at left does not include the planet's thick, opaque atmosphere. The image was obtained by the Magellan spacecraft that orbited Venus from 1990 to 1994. Magellan used cloud-penetrating…
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from article Venus
Venus viewed in visible light by the Galileo spacecraft during a 1990 gravity assist flyby on the probe's ultimate journey to Jupiter. (Credit: NASA)
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from article Venus
Global Venus clouds, as viewed in the ultraviolet from Venus Express. These features can be used to track winds and atmospheric motion at the cloud tops. Convection clouds can be seen near the equator (top of image), whereas streaky brighter clouds…
Image
from article Venus
Inhomogeneities in the total thickness of the clouds between 48 and 70 km (30 and 43 mi) show up in the near-infrared. These clouds, seen only at night, are backlit from the hot atmosphere below it (similar to a Chinese lantern), where bright…
Image
from article Venus
Perspective view of the southern boundary of Laksmi Planum, a plateau 2.5–4.0 km (1.5–2.5 mi) high. (Credit: NASA/JPL)
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from article Venus
Magellan image of the central and northern parts of the highland region Ovda Regio (north at top). Ridges running approximately east-west (horizontally) have been interpreted as resulting from crustal shortening (compression). Ridges are cut by…
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from article Venus
Perspective view of a portion of the Western Eistla Regio, with a rift valley in the foreground and the volcanoes Gula Mons (right) and Sif Mons (left) on the horizon. (Credit: NASA/JPL)
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from article Venus
Sapas Mons, one of several large volcanic edifices that compose the broad equatorial rise known as Alta Regio. (Credit: NASA/JPL)
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from article Venus
Computer-simulated perspective view, based on data from Magellan spacecraft, showing three impact craters in the northwestern portion of Lavinia Planitia with diameters ranging from 37 to 63 km (23 to 39 mi). (Credit: NASA/JPL)
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from article Crosstalk
Crosstalk in a space-division system. Z1, Z2, Z3, and Z4 designate impedances.
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from article Computer-aided circuit design
Four phases in creating a microelectronic chip. (a) Design. (b) Fabrication. (c) Testing. (d) Packaging. (After G. De Micheli, Synthesis and Optimization of Digital Circuits, McGraw-Hill, 1994)
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from article Computer-aided circuit design
Three abstraction levels of a circuit representation. (a) Architectural level. (b) Logic level. (c) Geometrical level. (After G. De Micheli, Synthesis and Optimization of Digital Circuits, McGraw-Hill, 1994)
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from article Saccopharyngiformes
Pelican or gulper eel (Eurypharynx pelecanoides), a member of the order Saccopharyngiformes. [Photo by Alexei Orlov, Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), Moscow, Russia]
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from article Computer security
Applications such as power generation, stock trading, airplane navigation, and medical care have become so dependent on computing that loss of availability becomes a serious threat to life or society. Even on a less dramatic level, people have…
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from article Computer security
Smartphone with fingerprint identification. (Credit: Anatoliy Babiy/Getty Images)
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from article Astronomy
A photograph of the Milky Way in the night sky over the European Southern Observatory's 3.6-metre telescope, at right, at the La Silla Observatory in northern Chile. [Credit: ESO/B. Tafreshi (twanight.org)]
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from article Astronomy
An artist’s impression of the exoplanet GJ 504, a world several times the size of Jupiter and anticipated to have a magenta color, still glowing from its initial formation. (Credit: NASA's Goddard Space Flight Center/S. Wiessinger)
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from article Astronomy
The Hubble Space Telescope in orbit above Earth. (Credit: NASA)
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from article Wine
Stainless steel fermentation tanks (fermenters). (Credit: Granger Wootz/Blend Images LLC)
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from article Wine
Dark-skinned grapes ready for harvest in France. (Credit: Getty Images/RooM RF)
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from article Programmable controller
Functional architecture of a typical high-performance single-chip microcontroller used for control and signal processing. (National Semiconductor Corp.)
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from article Orbital motion
Orbital motion in a plane, in the shape of an ellipse, with the primary body at the focus F.
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from article Orbital motion
Orbit oriented in space with respect to a fundamental plane, in this case the celestial equator.
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from article Llama
The llama (Lama glama) of South America. (Copyright © McGraw Hill)
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from article Platypus
Platypus, a primitive aquatic mammal. (Photograph by Paddy Ryan/Ryan Photographic)
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from article Cashew
Cashew (Anacardium occidentale). The cashew nut is contained in a hard shell at the bottom of the fruit (cashew apple). (Credit: Laura Lartigue/U.S. Agency for International Development, Guinea)
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from article Radio broadcasting
Predicted daytime and nighttime interference-free field strength coverage contours of the AM station KLOK in San Jose, California.
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from article Radio broadcasting
FM broadcast baseband frequency spectrum.
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from article Radio broadcasting
Predicted 3.16-mV/m coverage contour for the 100-kW station KUGN in Eugene, Oregon. The broken line represents coverage based on FCC field strength curves. The solid lines and “islands” represent a more realistic depiction of coverage that…
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from article Macrostomorpha
Macrostomum lignano, a new species from the northern Adriatic near Lignano, Italy. (a) Photomicrograph of a living, slightly squeezed worm. (b) Diagram showing the major organ systems. (From L. Schärer, G. Joss, and P. Sandner, Mating behavior of…
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from article Atomic clock
A cesium fountain clock at the National Physical Laboratory in the United Kingdom. (Credit: National Physical Laboratory, United Kingdom)
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from article Atomic clock
Basic schematic of a cesium atomic-beam clock.
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from article Atomic clock
Basic schematic of a hydrogen maser.
