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from Google Alert - anonymous https://www.google.com/url?rct=j&sa=t&url=https://twitter.com/YourAnonNews%3Flang%3Dta&ct=ga&cd=CAIyGjgxMzAxNTQ0ZWE3M2NhMmQ6Y29tOmVuOlVT&usg=AFQjCNHrt8YPSz_ln9ny1Mjztm31IpxRNA
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Google's Project to Offer Free Superfast Wi-Fi Internet to the World has Begun

Imagine a city with Wi-Fi hotspot. Now imagine that it is free as well. This won't be just an imagination for long as Google has unveiled its new plan to bring Free, Superfast Wi-Fi to cities around the world. Sidewalk Labs, a Google-owned company that focuses on improving city living through technology innovations, has announced that the company will roll out free WiFi to everyone in New

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A Slice of Light: How IRIS Observes the Sun

The Interface Region Imaging Spectrograph (IRIS) explorer is one of the latest imaging spectrographs developed for NASA missions, this one designed for exploring the energization process in the solar chromosphere at higher resolution than previously possible. An imaging spectrograph not only takes an image of the region of interest, but also has a small slit in the imager (seen as a dark line about half-way across the image) which passes a thin ribbon of light to a spectroscope. The spectroscope spreads the light out in its component frequencies or spectrum. Monitoring of specfic spectral lines provides additional information on the velocity (and therefore temperature) of plasma in the observed region. In the visualization presented here, the IRIS slit-jaw imager (SJI) takes images with two different filters, one at 1330 Angstroms (gold color table), the other at 1400 Angstroms (bronze color table), and these images are displayed overlaying corresponding imagery from the Solar Dynamics Observatory (SDO) 304 Angstrom filter (grayscale). The spectra, in this case a closeup view on the 1403 Angstrom line from 3-times ionized silicon (designated Si IV), is presented on a semi-transparent plane perpendicular to the images, at the position of the slit in the imager. This allows us to see correlations between features in the images and spectra. For example, some of the bright spots in the image correlate to wider regions along the line suggesting higher temperatures and/or velocities of the plasma emitting the spectral line. To better examine the region, the instrument also scans the slit over the region of interest, collecting multiple spectra. This allows scientists to compare and correlate structures seen in images with speeds and temperatures of the plasma. Imaging spectrographs have been flown on other NASA missions, such as the STIS instrument on the Hubble space telescope.

from NASA's Scientific Visualization Studio: Most Recent Items http://ift.tt/1ICFwk0
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A Slice of Light: How IRIS Observes the Sun

The Interface Region Imaging Spectrograph (IRIS) explorer is one of the latest imaging spectrographs developed for NASA missions, this one designed for exploring the energization process in the solar chromosphere at higher resolution than previously possible. An imaging spectrograph not only takes an image of the region of interest, but also has a small slit in the imager (seen as a dark line about half-way across the image) which passes a thin ribbon of light to a spectroscope. The spectroscope spreads the light out in its component frequencies or spectrum. Monitoring of specfic spectral lines provides additional information on the velocity (and therefore temperature) of plasma in the observed region. In the visualization presented here, the IRIS slit-jaw imager (SJI) takes images with two different filters, one at 1330 Angstroms (gold color table), the other at 1400 Angstroms (bronze color table), and these images are displayed overlaying corresponding imagery from the Solar Dynamics Observatory (SDO) 304 Angstrom filter (grayscale). The spectra, in this case a closeup view on the 1403 Angstrom line from 3-times ionized silicon (designated Si IV), is presented on a semi-transparent plane perpendicular to the images, at the position of the slit in the imager. This allows us to see correlations between features in the images and spectra. For example, some of the bright spots in the image correlate to wider regions along the line suggesting higher temperatures and/or velocities of the plasma emitting the spectral line. To better examine the region, the instrument also scans the slit over the region of interest, collecting multiple spectra. This allows scientists to compare and correlate structures seen in images with speeds and temperatures of the plasma. Imaging spectrographs have been flown on other NASA missions, such as the STIS instrument on the Hubble space telescope.

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Stars of a Summer Triangle

Rising at the start of a northern summer's night, these three bright stars form the familiar asterism known as the Summer Triangle. Altair, Deneb, and Vega are the alpha stars of their respective constellations, Aquila, Cygnus, and Lyra, nestled near the Milky Way. Close in apparent brightness the three do look similar in these telescopic portraits, but all have their own stellar stories. Their similar appearance hides the fact that the Summer Triangle stars actually span a large range in intrinsic luminosity and distance. A main sequence dwarf star, Altair is some 10 times brighter than the Sun and 17 light-years away, while Vega, also a hydrogen-fusing dwarf, is around 30 times brighter than the Sun and lies 25 light-years away. Supergiant Deneb, at about 54,000 times the solar luminosity, lies some 1,400 light-years distant. Of course, with a whitish blue hue, the stars of the Summer Triangle are all hotter than the Sun. via NASA http://ift.tt/1Ij77Lp