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from article Helmholtz resonator
Helmholtz resonator. Symbols are explained in text.
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from article Lawson criterion
Typical plot of minimum value of nτ necessary for net release of energy versus ion kinetic temperature in a mixture containing equal amounts of deuterium and tritium. (After J. M. Hollander, ed., Annu. Rev. Energy, 1:213–255, 1976)
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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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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)]
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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…
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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)
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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)
