The Earth-orbiting satellite Hinode caught this stunning video of the annular solar eclipse Jan. 4.
An annular eclipse occurs when the moon is slightly farther from Earth than usual and appears slightly smaller. When it moves between the Earth and sun, it covers the center of the sun, leaving a bright, fiery ring, or annulus, at the edge. Hinode, a Japanese mission, studies the sun’s magnetic fields and surface eruptions. The satellite carries three NASA-developed telescopes that capture different types of light:
Video: Hinode/XRT Original Article by Danielle Venton
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By Dan Vergano, USA TODAY & By: Lea Winerman , PBS News Deep sea bacteria completely devoured much of the natural gas released in the Gulf of Mexico oil spill, a scientific team concluded Thursday. The findings help build the case that ocean bottom bugs are a natural biofilter that regularly dine on natural seeps of methane, or natural gas, and related chemicals worldwide. Methane was the most abundant component of the summer oil spill. About 220,000 tons was released from April to July. The finding adds to evidence that deepwater microbes also consumed other "light" crude oil constituents, such as propane and ethanol, released in the spill. "We expected the methane to persist longer," says study co-author David Valentine of the University of California, Santa Barbara, based on June estimates. By September, he says, "the complete consumption of methane came as a surprise." Measures suggest only 0.01% of the methane released in the spill still lingered at depth. by Scott Carmichael Stories about a shift in the Earth's magnetic north pole are usually topics for the Science Channel, or a great way to score bonus points in an otherwise boring conversation - but now the phenomenon has actually forced an airport to close one of its runways so they can repaint its designation. Tampa airport Runway 18R/36L will be called 19R/1L after it reopens on January 13. Later this month, the other runways at Tampa airport will undergo the same transformation. The magnetic north pole has been shifting towards Russia at 40 miles a year for the past decade due to changes in the core of our planet. In 2009, National Geographic posted a study on the effects of these changes which is really worth reading if you'd like to learn more about what goes on inside Earth. Original Article Date: June 22, 2009 by Ker Than Reposted 1/7/11 by Zach Royer, A2 The flow of seawater across Earth's surface could be responsible for small fluctuations in the planet's magnetic field, a controversial new study says. If so, the research would challenge the widely accepted theory that Earth's magnetic field is generated by a churning molten core, or dynamo, in the planet's interior. "If I am correct, then the dynamo theory is in bad shape, and all kinds of things about core dynamics also fall apart," said study author Gregory Ryskin, an associate professor of chemical and biological engineering at Northwestern University in Illinois. Ryskin's study has attracted fierce criticism from other geophysicists, with some experts dismissing the idea as "junk" science. "I strongly believe the new hypothesis is just nonsense," said geophysicist Robert Parker of the University of California, San Diego. Such reactions were not entirely unexpected. "This article is controversial and will no doubt cause vigorous debate, and possibly strong opposition, from some parts of the geomagnetism community," Tim Smith, senior publisher of the New Journal of Physics, which published Ryskin's findings, said in a statement. by Eliza Barclay Fluoride is a finicky friend to teeth. Too little of it, and you get cavities. Too much, and it starts to eat away and discolor the enamel of your pearly whites. The federal government said Friday morning that the fluoride seesaw in this country has tipped too far toward excess. These days kids are getting fluoride from many sources, including drinking water, toothpaste and mouth rinses. So the U.S. Department of Health and Human Services together with the U.S. Environmental Protection Agency are proposing to drop the recommended level of fluoride in drinking water to the lowest end of the current range. That would put it at 0.7 milligrams per liter of water (mg/L) quite a bit below the previous recommended maximum of 1.2 mg/L. |
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