Image
from article Stress (psychology)
Dimensions of stressful experiences. (Image courtesy of the National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health)
Search Results
Search Results
Refine this search
Search result paging links
1,689 results
Image
from article Stress (psychology)
Diagram of the hypothalamic-pituitary-adrenal axis. The thicker arrow indicates that the feedback of glucocorticoids on ACTH is most potent. Abbreviations: ACTH, adrenocorticotropic hormone; CRH, corticotropin-releasing hormone.
Image
from article Dawn mission
An artist's impression of the Dawn spacecraft in orbit around Vesta. (Credit: NASA/JPL)
Image
from article Dawn mission
The interplanetary trajectory of the Dawn spacecraft. (Credit: NASA)
Image
from article Dawn mission
A natural color image of Vesta taken by the Dawn spacecraft. (Credit: NASA / JPL / MPS / DLR / IDA / Björn Jónsson)
Image
from article Dawn mission
A natural color image of Ceres captured by Dawn, showing some bright salty deposits on the dwarf planet's cratered surface. (Credit: NASA / JPL-Caltech / UCLA / MPS / DLR / IDA / Justin Cowart)
Image
from article Dawn mission
Vesta topography shown as color-contoured Mollweide projection. Topography in kilometers (scale bar at bottom) is calculated relative to a reference ellipsoid of 285 × 285 × 229 km (177 × 177 × 142 mi). (Credit: F. Preusker, German Aerospace Center)
Image
from article Dawn mission
Distribution of hydrogen (H) on the Vestan surface, seen by the gamma ray and neutron detector (GRaND) instrument. (Credit: T. Prettyman, Planetary Science Institute)
Image
from article Dawn mission
Distribution of hydrogen (H) on the Cerian surface, seen by the gamma ray and neutron detector (GRaND) instrument. (Credit: NASA/JPL-Caltech/UCLA/ASI/INAF)
Image
from article Exoplanet
An artist’s impression of a small, rocky, and icy exoplanet. (Credit: ESO)
Image
from article Exoplanet
The exoplanet HD95086 b, at bottom left, directly imaged around its star. The central star has been removed through data processing from the image and replaced with a star symbol. This false-color infrared image was obtained using Very Large…
Image
from article Exoplanet
Stellar wobble that results when an unseen planet orbiting a star gravitationally tugs the star in a small counterorbit. The planet can be detected by observing the star's periodic wobble relative to background stars (astrometry) or by observing the…
Image
from article Exoplanet
Photometric transit technique. For systems with orbits aligned with the Earth, the planet will pass directly in front of its host star once every orbit. The planet will block a fraction of the light from the star, revealing the size and orbital…
Image
from article Exoplanet
A classification scheme, called the Periodic Table of Exoplanets, that categorizes the number of known exoplanets according to three orbital temperature zones and six mass/radius classes. The majority of worlds represented in the table, updated last…
Image
from article Exoplanet
A graphic depiction of the habitable zone, running from approximately the orbit of Venus to beyond Mars assuming a Sun-like star, shown in astronomical units (AU) in log scale on the x-axis. The zone becomes closer to a star as its mass and…
Image
from article Exoplanet
An artist's impression making a comparison between the eight planets in the Kepler-90 solar system with our own solar system's planets. Planet sizes are to scale, but not distances from the host star or to each other. (Credit: NASA/Ames Research…
Image
from article Exoplanet
Artist's impression of the hot Jupiter HD 209458b, whose outer atmosphere is boiling off into space under intense heating from its host star, creating a comet's like-tail of material, colored blue in this image. [Credit: European Space Agency,…
Image
from article Exoplanet
An artist’s impression of the Transiting Exoplanet Survey Satellite, or TESS. (Credit: Massachusetts Institute of Technology)
Image
from article Infrared astronomy
Observations by the Spitzer Space Telescope in infrared light reveal the stellar nursery DR21 in our Milky Way, in the constellation of Cygnus. The many bright new stars are completely hidden in optical wavelengths by the enormous stores of dust in…
Image
from article Infrared astronomy
Plots of the energy flux emitted by a blackbody as a function of wavelength for several temperatures. Hotter objects are substantially brighter and emit most of their energy at shorter wavelengths. Objects cooler than a few thousand kelvins emit…
Image
from article Infrared astronomy
NASA Hubble Space Telescope images at optical and infrared wavelengths of Pillar and Jets HH 901/902. (a) Visible-wavelength image showing numerous dust clouds whose embedded stars remain hidden. (b) Image taken at infrared wavelengths, in which the…
Image
from article Infrared astronomy
Atmospheric transmission as a function of wavelength throughout the visible and infrared parts of the electromagnetic spectrum, showing atmospheric windows, which are wavelengths where celestial objects can be observed from the surface of the Earth.
Image
from article Infrared astronomy
An infrared view of Jupiter taken by the NASA's InfraRed Telescope Facility (IRTF) in 2015. (Credit: NASA/JPL-Caltech)
Image
from article Infrared astronomy
An artist's impression of the Spitzer Space Telescope. (Credit: NASA/JPL-Caltech)
Image
from article Seasonal affective disorder
Exposure to bright light via a light-therapy box during winter is an effective treatment for individuals suffering from seasonal affective disorder. (Credit: Getty Images)
Image
from article Seasonal affective disorder
Individuals suffering from seasonal affective disorder often exhibit a variety of symptoms of depression, including increased sleep length, weight gain, and craving for carbohydrates, as well as sexual and social problems, anxiety, lethargy, and…
Image
from article Time
Division of the world into 24 time zones, progressively differing from Greenwich by 1 hour. Some countries use half-hour intervals or fractional hours. Letter designations are shown, and the key indicates number of hours by which zone time must be…
Image
from article Time
The improvement in timekeeping accuracy with time. The broken colored line shows the accuracy of clock measurements. The broken gray line shows the accuracy of the Earth's rotation in providing an accurate time scale.
Image
from article Wavelets
Members of a wavelet family: an original and two shifted and dilated copies. (a) Original wavelet ψ with width w. (b) Large-scale wavelet ψa,b, with width aw that is larger than the original width w. (c) Fine-scale wavelet ψa,b with narrow width.
Image
from article Wavelets
Two examples of wavelets which generate an orthonormal basis, and which are associated with fast algorithms.
Image
from article Logic
Image
from article Logic
Image
from article Asteroid
Distribution of the brighter asteroids, with distance from the Sun, between the Earth and Jupiter. Major fractions of asteroid orbital periods to Jupiter's period are shown. The arrows point to associated clusters or Kirkwood gaps.
Image
from article Asteroid
Variation with time in the brightness of 7 Iris due to its irregular shape and 7.1-h rotation. (After G. Kuiper)
Image
from article Asteroid
Image
from article Asteroid
Visible and near-infrared reflection spectra of the major S and C compositional classes of asteroids, plus several unusual ones. Laboratory spectra for some similar meteorites are shown with colored lines.
Image
from article Asteroid
Main-belt asteroids imaged by spacecraft. (a) Mathilde imaged by Near Earth Asteroid Rendezvous (NEAR) spacecraft on June 27, 1997. (b) Gaspra imaged by Galileo spacecraft on October 29, 1991. (c) Ida imaged by Galileo on August 28, 1993. All three…
Image
from article Asteroid
Views of the two opposite sides of the asteroid 433 Eros, imaged from the NEAR-Shoemaker spacecraft. (NASA)
Image
from article Extraterrestrial intelligence
A portion of the Allen Telescope Array used by the SETI Institute in its search for extraterrestrial intelligence. (Credit: Seth Shostak/SETI Institute)
Image
from article Extraterrestrial intelligence
The Green Bank Telescope, which has a collecting dish area that covers more than 9300 m2. (Credit: NRAO/AUI/NSF)
Image
from article Extraterrestrial intelligence
The traditional Drake equation, appearing in full in the top row with its terms explained, offers a rough way to calculate the number of technologically advanced civilizations in our home galaxy, the Milky Way. The bottom row offers a variation on…
Image
from article Orion Nebula
Orion Nebula and its neighborhood. (a) Visual-wavelength view of the Orion Nebula obtained by taking a time exposure on a photographic plate with the 4-m-diameter (158-in.) telescope on Kitt Peak, Arizona (National Optical Astronomy Observatories).…
Image
from article Orion Nebula
Closeup view of the Trapezium stars obtained with the Planetary Camera on the Hubble Space Telescope. The field-of-view shown is 35 arcseconds of each side. Most faint stars have tails pointing away from the brightest star. These low-mass stars are…
Image
from article Orion Nebula
Hubble Space Telescope image showing the inner portion of the Orion Nebula in the light of doubly ionized oxygen (blue), atomic hydrogen (green), and singly ionized nitrogen (red). (C. R. O'Dell and S. K. Wong, Rice University; NASA)
Image
from article Orion Nebula
Hubble Space Telescope image showing closeups of several disks and ionized structures surrounding low-mass stars embedded within the Orion Nebula. The stars located near the Trapezium stars exhibit bright comet-shaped regions of gas expanding away…
Image
from article Gravitational radiation
Volume rendering of the gravitational radiation generated during the merger of a binary black hole system. The red spheres represent the horizons of the black holes. The color map shows positive wave amplitudes in yellow/red and negative amplitudes…
Image
from article Gravitational radiation
Effect of a gravitational wave, passing in a direction perpendicular to the plane of the paper, on a ring of test particles. The ring is distorted into an ellipse, elongated in one direction in one half-cycle of the wave, and elongated in the…
Image
from article Gravitational radiation
Orbital decay of the binary pulsar PSR 1913+16, discovered by Russell Hulse and Joseph Taylor in 1974. Data points show the measured change in the orbit (the periastron is the minimum separation of the pulsar from the center of mass of the binary…
Image
from article Gravitational radiation
The gravitational-wave signal GW150914, recorded by the LIGO detectors at Hanford, Washington, and Livingston, Louisiana, on September 14, 2015. The thick orange and blue lines show the data from the Hanford and Livingston detectors, respectively,…
Image
from article Graphic methods
Percentages of distribution of grades in a class, depicted by (a) bar graph and (b) circle graph.
