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from article Thirst and sodium appetite
Regulation of cellular water. ADH = antidiuretic hormone.
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Image
from article Thirst and sodium appetite
Hypovolemic thirst and sodium appetite are caused by altered sensory information from an underfilled circulation, reinforced by increases in circulating angiotensin II and mineralocorticoids. Angiotensin peptides generated from components of a…
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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 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…
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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…
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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 Astronomy
A photograph of the Milky Way in the night sky over the ESO 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 Speech
Human head and thorax. (Courtesy of G. E. Peterson)
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from article Speech
Action of the glottis during speech. (a) Six successive positions of the vocal folds in one vibration cycle at 120 Hz. (b) Relation between pitch and vocal fold tension. (Courtesy of D. W. Farnsworth)
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from article Speech
Sound spectrograms of the utterance “speech production.” (a) Energy patterns: A, pulse; B, periodic; C, aperiodic; and D, silence. (b) The dotted lines represent the pitch pattern of the utterance.
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from article Speech
Computer-generated three-dimensional spectral display of the spoken syllable “yah.”
Image
from article Speech
Speech flakes of vowels in the words (a) “far,” (b) “food,” and (c) “fee.” (Courtesy of Charles Wooters)
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from article Speech
Regions of the brain involved in speech. (a) Left hemisphere, usually more involved in speech functions than the right hemisphere. (b) A model for the neural processes involved in speaking a heard word. Arrows indicate the path of the relayed signal…
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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 Mental disorders
X-ray of a human brain (side view) against a black background. The image is transparent and detailed with soft blue swaps. (Credit: Brainmaster/Getty Images)
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from article Mental disorders
Colorized CT (computerizd tomography) scan of a healthy brain (view from above). The axial (horizontal) scan has revealed the head and brain in cross section. The front of the head is at the top. The ventricles (dark areas, center), which lie…
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from article Mass–luminosity relation
Mass-luminosity relation, where the abscissa is the logarithm of mass M and the ordinate is the logarithm of luminosity L, both relative to the Sun as unit. This relation is typically plotted with the brightest, most massive stars at the upper left,…
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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 )
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…
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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)
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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)
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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)
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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 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)
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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 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 Earth rotation and orbital motion
Excess length of day [length of day − 86,400 atomic Système International (SI) seconds], measured in milliseconds.
Image
from article Earth rotation and orbital motion
Couple produced by tidal friction.
Image
from article Earth rotation and orbital motion
Schematic representation of the Earth's orbit.
Image
from article Earth rotation and orbital motion
Equation of time.
