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The Radio Spectrum of the U.S.
Posted in Technology
This intricate image shows you the allocation of the radio spectrum in the United States of America. From maritime military zones to television broadcasts, you'd be surprised just how heavily tapped radio frequencies really are.
Solar Corona
Posted in Astronomy
The image shows the corona for a moderately active Sun, with some (red) hot active regions in both hemispheres, surrounded by the (blue/green) cooler plasma of the quiet-Sun corona. Notice also the north polar-crown filament, the trans-equatorial loops, and the coronal hole in the south-east (lower-right) corner of the image and the smaller one over the north pole. This image shows the solar corona in a false-color, 3-layer composite: the blue, green, and red channels show the 171, 195, and 284 wavelengths, respectively (most sensitive to emission from 1, 1.5, and 2 million degree gases). (TRACE Project, Stanford-Lockheed Institute for Space Research, NASA)
Solar Photosphere
Posted in Astronomy
Image of an active solar region taken on July 24, 2002 near the eastern limb of the Sun. The image highlights the three-dimensional nature of the photosphere when seen at these large angles. The structures in the dark sunspots in the upper central area of the image show distinct elevation above the dark "floor" of the sunspot. The height of the structures has been estimated by Dr. Bruce Lites of the High Altitude Observatory to be between 200 and 450 km. The smallest resolvable features in the image are about 70 km in size. There are also numerous bright "faculae" visible on the edges of granules that face towards the observer. (Prof. Goran Scharmer/Dr. Mats G. Lfdahl/Institute for Solar Physics of the Royal Swedish Academy of Sciences)
Solar Minimal State
Posted in Astronomy
The Sun, observed on May 22, 2008. With the Sun persisting in a near-minimal state of activity, only a few small regions of some activity are seen on the disk. The cell-like appearance is formed by the multitude of small clusters of magnetic flux that are collected in the downflow regions of the supergranular network of convective motions. (NASA/TRACE)
Solar Seismic Waves
Posted in Astronomy
Solar flares produce seismic waves in the Sun's interior that closely resemble those created by earthquakes on our planet. On May 27, 1998, researchers observed this flare-generated solar quake that contained about 40,000 times the energy released in the great earthquake that devastated San Francisco in 1906, equivalent to an 11.3 magnitude earthquake, scientists calculated. Over the course of an hour, the solar waves traveled for a distance equal to 10 Earth diameters before fading into the fiery background of the Sun's photosphere. Unlike water ripples that travel outward at a constant velocity, the solar waves accelerated from an initial speed of 22,000 miles per hour to a maximum of 250,000 miles per hour before disappearing. (Courtesy of SOHO/EIT consortium. SOHO is a project of international cooperation between ESA and NASA)
Solar Magnetic Structures
Posted in Astronomy
Detailed closeup of magnetic structures on the Sun's surface, seen in the H-alpha wavelength on August 22, 2003. (Swedish 1-m Solar Telescope (SST) operated by the Royal Swedish Academy of Sciences, Oddbjorn Engvold, Jun Elin Wiik, Luc Rouppe van der Voort)

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// Most Viewed

1. Solvay Conference - 1927
1. Solvay Conference - 1927

(The International Solvay Institutes for Physics and Chemistry, are located in Brussels. They were founded by the Belgian industrialist Ernest Solvay in 1912, following the first world physics conference. - 1911 Conseil Solvay.

This photo was taken on October 1927 during the Fifth Solvay International Conference on Electrons and Photons, where the world's leading physicists met to discuss the newly created quantum theory. The leading figures were Albert Einstein and Niels Bohr.

Einstein, disenchanted with Heisenberg's "Uncertainty Principle," remarked "God does not play dice." Bohr replied, "Einstein, stop telling God what to do.")

Hits: 68237
Category: Humanity
2. Australian Sunrise
2. Australian Sunrise

(Captivating sunrise seen from Nudgee Beach, Queensland, Australia.)
Hits: 43466
Category: Earth Sciences
3. Drug Classification Chart
3. Drug Classification Chart

(This image breaks down the majority of common drugs and stimulants into tranquillizers, depressants, stimulants and hallucinogens and shows you how much it falls into each category.)
Hits: 26436
Category: Biology & Medicine
4. Iberian Lynx
4. Iberian Lynx

(Although not targeted by hunters the Iberian Lynx is a category 1 endangered species which means that there are less than 100 in the wild. Their main staple diet is the hare. Most of the ones killed, lose their lives in traps set for other animals. )
Hits: 18886
Category: Plants & Animals
5. Japanese Dwarf Flying Squirrel
5. Japanese Dwarf Flying Squirrel

(Its body is 14-20cm long and the tail length is 10-14cm. It weighs 150-220g. It is nocturnal, and during the day it rests in holes in trees. It eats seeds, fruit, tree leaves, buds and bark. It faces threats from habitat destruction. )
Hits: 17520
Category: Plants & Animals
6. Supermassive Black Hole
6. Supermassive Black Hole

(In 1987, a 30-million-Sun black hole was found independently by Canadian astronomer John Kormendy and US astronomers Alan Dressler and Douglas Richstone. Many more have been found since then. This is a simulation of a black hole.)
Hits: 14845
Category: Astronomy
7. A Rose For You
7. A Rose For You

(Even the squirrels stop to smell the roses.)
Hits: 14654
Category: Astronomy
8. Purple Spiny Flower Mantis
8. Purple Spiny Flower Mantis

(A flower mantis in Kololo, Kampala. )
Hits: 14452
Category: Plants & Animals
9. Tornado Rainbow
9. Tornado Rainbow

(In this spooky shot, a massive tornado is seen forming just behind a scenic rainbow.)
Hits: 13835
Category: Earth Sciences
10. Transporting 60 People
10. Transporting 60 People

(This poster hangs in the Planning Office in the city of Munster, Germany. It very graphically demonstrates the need for an effective transit strategy by showing how much space it takes to move 60 people via cars, buses, and bicycles.)
Hits: 12841
Category: Humanity

// Top Rated

1. Optical Fiber
1. Optical Fiber

(An optical fiber (or fibre) is a glass or plastic fiber designed to guide light along its length by total internal reflection.)
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Category: Technology
2. Arc Welding
2. Arc Welding

(The arc welding process.)
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Category: Technology
3. Edison And The Phonograph
3. Edison And The Phonograph

(Thomas Edison and his early phonograph.)
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Category: Technology
4. Microprocessor
4. Microprocessor

(Macro shot of an Intel 80486DX2 die in its packaging. The actual size of the die in the center is 126.75 mm.)
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Category: Technology
5. Magma
5. Magma

(A magnificent photo of a volcanic eruption.)
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Category: Earth Sciences
6. Expedition 27 - Soyuz Launch
6. Expedition 27 - Soyuz Launch

(Expedition 27 is the current, 27th expedition to the International Space Station, which started on 16 March 2011.)
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Category: Astronomy
7. Scale of Cyclone Yasi
7. Scale of Cyclone Yasi

(In February 2011 a colossal cyclone (named Yasi) struck Australia as a top-rated category 5 storm. It wasn't just the strength that made this storm special; this image gives you a sense of scale for this tropical behemoth.)
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Category: Earth Sciences
8. Stunning Waterfalls
8. Stunning Waterfalls

(Waterfalls at Plitvicka Jezera National Park. Photo 2004 by Jack Brauer.)
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Category: Earth Sciences
9. Twin Linear Aerospike XRS-2200 Engine
9. Twin Linear Aerospike XRS-2200 Engine

(The test of twin Linear Aerospike XRS-2200 engines, originally built for the X-33 program, was performed on August 6, 2001 at NASA's Stennis Space Center, Mississippi. The engines were fired for the planned 90 seconds and reached a planned maximum power of 85 percent. NASA's Second Generation Reusable Launch Vehicle Program , also known as the Space Launch Initiative (SLI), is making advances in propulsion technology with this third and final successful engine hot fire, designed to test electro-mechanical actuators. Information learned from this hot fire test series about new electro-mechanical actuator technology, which controls the flow of propellants in rocket engines, could provide key advancements for the propulsion systems for future spacecraft. The Second Generation Reusable Launch Vehicle Program, led by NASA's Marshall Space Flight Center in Huntsville, Alabama, is a technology development program designed to increase safety and reliability while reducing costs for space travel. The X-33 program was cancelled in March 2001.)
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Category: Astronomy
10. Space Walker
10. Space Walker

(A close up photo of an astronaut in the cargo bay of the Space Shuttle. Click here for the high-resolution.)
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Category: Astronomy