News tagged with ultraviolet radiation
VLT takes most detailed infrared image of the Carina Nebula
(PhysOrg.com) -- ESO's Very Large Telescope has delivered the most detailed infrared image of the Carina Nebula stellar nursery taken so far. Many previously hidden features, scattered across a spectacular ...
Feb 08, 2012 |
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A pocket of star formation
(PhysOrg.com) -- This new view shows a stellar nursery called NGC 3324. It was taken using the Wide Field Imager on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile. The intense ultraviolet ...
Feb 01, 2012 |
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Hot cores in dark clouds
(PhysOrg.com) -- The earliest stages in the life of a star are among the most mysterious. This is primarily because stars form inside dark clouds of material that block optical light, and because they form ...
Dec 06, 2011 |
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Image: Young stellar grouping in Cygnus X
(PhysOrg.com) -- Cygnus X hosts many young stellar groupings.
Nov 30, 2011 |
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Human skin begins tanning in seconds, and here's how
We all know that human skin tans after days spent in the sun. That relatively slow process has known links to ultraviolet (and specifically UVB) exposure, which leads to tanning only after it damages the DNA of skin cells. ...
Nov 03, 2011 |
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Clearing the cosmic fog of the early universe: Massive stars may be responsible
The space between the galaxies wasn't always transparent. In the earliest times, it was an opaque, dense fog. How it cleared is an important question in astronomy. New observational evidence from the University ...
Oct 12, 2011 |
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Astrophysics and extinctions: News about planet-threatening events
Space is a violent place. If a star explodes or black holes collide anywhere in our part of the Milky Way, they'd give off colossal blasts of lethal gamma-rays, X-rays and cosmic rays and it's perfectly reasonable to expect ...
Space & Earth / Space Exploration
Oct 07, 2011 |
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New technology uses solar UV to disinfect drinking water
(PhysOrg.com) -- A team of Purdue University researchers has invented a prototype water-disinfection system that could help the world's 800 million people who lack safe drinking water.
Sep 29, 2011 |
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Image: Asteroid caught marching across Tadpole Nebula
(PhysOrg.com) -- This infrared image from NASA's Wide-field Infrared Survey Explorer, or WISE, showcases the Tadpole Nebula, a star-forming hub in the Auriga constellation about 12,000 light-years from Earth. ...
Sep 28, 2011 |
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Japan carrier unveils smartphone radiation gauge
Japan's top mobile phone operator NTT DoCoMo is to unveil a smartphone with changeable "jackets" that measure bad breath, body fat and even radiation levels.
Electronics / Consumer & Gadgets
Sep 22, 2011 |
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Researchers probe genetic link to blindness
University of Leeds researchers have used next-generation DNA sequencing techniques to discover what causes a rare form of inherited eye disorders, including cataracts and glaucoma, in young children.
Sep 08, 2011 |
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More evidence that caffeine lowers risk of skin cancer
There might be a time when instead of just drinking that morning cup of coffee you lather it on your skin as a way of preventing harmful sun damage or skin cancer.
Aug 15, 2011 |
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Tanning bed users exhibit brain changes and behavior similar to addicts
People who frequently use tanning beds may be spurred by an addictive neurological reward-and-reinforcement trigger, researchers at UT Southwestern Medical Center have found in a pilot study.
Medicine & Health / Psychology & Psychiatry
Aug 10, 2011 |
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Grapes protect against ultraviolet radiation
Some compounds found in grapes help to protect skin cells from the sun's ultraviolet radiation, according to a study by researchers from the University of Barcelona and the CSIC (Spanish National Research Council). The study ...
Jul 29, 2011 |
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Wave power can drive Sun's intense heat
A new study sheds light on why the Sun's outer atmosphere, or corona, is more than 20 times hotter than its surface. The research, led by the National Center for Atmospheric Research (NCAR), may bring scientists a step closer ...
Space & Earth / Space Exploration
Jul 27, 2011 |
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Ultraviolet
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV. It is so named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the color violet.
UV light is found in sunlight and is emitted by electric arcs and specialized lights such as black lights. As an ionizing radiation it can cause chemical reactions, and causes many substances to glow or fluoresce. Most people are aware of the effects of UV through the painful condition of sunburn, but the UV spectrum has many other effects, both beneficial and damaging, on human health.
For more information about Ultraviolet, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
