Science

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Laser light at useful wavelengths from semiconductor nanowires: Nanowire lasers could work with silicon chips, optical fibers, even living cells

Thread-like semiconductor structures called nanowires, so thin that they are effectively one-dimensional, show potential as lasers for applications in computing, communications, and sensing. Scientists at the Technische Universitaet Muenchen (TUM) have demonstrated laser action in semiconductor nanowires that emit light at technologically useful wavelengths and operate at room temperature.

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TUM researchers have demonstrated that semiconductor nanowires like the one shown here can act both as lasers, generating coherent pulses of light, and as waveguides, similar to optical fibers. Because these nanowire lasers emit light at technologically useful wavelengths, can be grown on silicon substrates, and operate at room temperature, they have potential for applications in computing,

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Goddard Planetary Instruments Score a Hat Trick

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Three mass spectrometers built at Goddard were operating on the same day at the moon, on Mars and en route to Mars.

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Goddard Planetary Instruments Score a Hat Trick

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Three mass spectrometers built at Goddard were operating on the same day at the moon, on Mars and en route to Mars.

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New Instrument Continues Gathering Sun's Effects on the Earth

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Total solar irradiance (shown in color) over the past three solar cycles since 1978 adjusted to a ground-based cryogenic instrument funded by NASA in collaboration with the National Institute of Standards and Technology (NIST).

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Supernova Blast Provides Clues to Age of Binary Star System

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NASA's Cassini Spacecraft Obtains Best Views of Saturn Hexagon

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This colorful view from NASA's Cassini mission is the highest-resolution view of the unique six-sided jet stream at Saturn's north pole known as "the hexagon." This movie, made from images obtained by Cassini's imaging cameras, is the first to show the hexagon in color filters, and the first movie to show a complete view from the north pole down to about 70 degrees north latitude.

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Turning waste into power with bacteria — and loofahs

Loofahs, best known for their use in exfoliating skin to soft, radiant perfection, have emerged as a new potential tool to advance sustainability efforts on two fronts at the same time: energy and waste.

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Loofahs, thanks to their large pores, have emerged as a potential new tool to advance sustainability efforts on two fronts at the same time: energy and waste.

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Curing Cancer with Magnetic Nanoparticles

Researchers are curing cancer in mice with magnetic nanoparticles, after a single, three-minute treatment.

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Iron particles inside a tumor spin in an alternating magnetic field, generating enough heat to cook the cancer.

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A Fiery Drama of Star Birth and Death

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Comet ISON: has this lonely traveller reached the end of its journey?

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An image of Comet ISON, captured by the Hubble Telescope