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Gizmorama - NASA mission: Map Earth's soil moisture
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Good Morning,
Can you believe that the end of April is already here! What
tulips the rabbits didn't eat in my yard are in full bloom
and I can't wait to get out and start the rest of my planting.
Hopefully warm weather will be here to stay soon! Enjoy today's
articles.
Until Tomorrow,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
Email your comments
P.S. You can discuss this issue or any other topic in the new
Gizmorama forum. Check it out here...
http://archives.gophercentral.com/forum/forums/forum-view.asp?fid=23
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NASA's Polar satellite ends its mission
The U.S. space agency says its Polar satellite has concluded
its 12-year mission to study the Northern and Southern lights.
When the Polar satellite was launched in February 1996, the
plan was for a two-year mission to study the lights that form
a ring around Earth's north and south magnetic poles. Polar
exceeded expectations by a decade. "We've gone well beyond our
original plan and into our dreams," says John Sigwarth of the
National Aeronautics and Space Administration's Goddard Space
Flight Center in Greenbelt, Md. "Polar ran out of fuel during
its final maneuver in February," said Sigwarth. "But even after
the fuel was exhausted, we continued to maneuver on the cold
helium gas that was left in the tank," he said, likening that
to "using the force of your breath as you breathe out to propel
yourself backward" if you happen to be traveling through space
like a satellite. But now, he said, Polar has run out of
breath. Controllers turned off the satellite Monday, slightly
ahead of a likely fatal encounter with the sun. From its
current orientation, Polar will drift slowly, allowing the
sun's energy to quickly overwhelm the satellite, Sigwarth
said.
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Lungs are illuminated for better diagnoses
British medical scientists say they have created a technology
that illuminates a person's lungs to help determine if they
are correctly functioning. The University of Sheffield
researchers said their technology could result in earlier
diagnosis of emphysema and smoking related damage, as well
as other lung conditions and diseases. The technique involves
a person inhaling small amounts of harmless hyperpolarized
noble gases (Helium-3 and Xenon-129), which are then imaged
inside a MRI scanner. The gases are hyperpolarized using high
power lasers by a process called optical pumping. The high
resolution images of the air spaces that are produced offer
additional functional information that is currently not
available with traditional X-rays and other types of scans,
the researchers said. The technology can also be used to help
detect the early stages of lung obstruction in children with
cystic fibrosis, something which a traditional X-ray would
miss, they said. The scientists said they are now considering
using the technology to assess inhaled therapies for asthma
patients and help plan radiotherapy treatment in patients with
lung cancer.
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NASA mission: Map Earth's soil moisture
A Massachusetts Institute of Technology professor will lead a
team designing a U.S. satellite mission to map the Earth's soil
moisture. Professor Dara Entekhabi said the National Aeronautics
and Space Administration satellite will also obtain freeze-thaw
measurements -- all data essential to the accuracy of weather
forecasts and predictions of global carbon cycle and climate.
At present, scientists have no network for gathering soil
moisture data as they do for rainfall, winds, humidity and
temperature, Entekhabi said. Instead, that data is gathered
only at a few scattered points around the world. "Soil moisture
is the lynch pin of the water, energy and carbon cycles over
land," said Entekhabi. "It is the variable that links these
three cycles through its control on evaporation and plant
transpiration. Global monitoring of this variable will allow
a new perspective on how these three cycles work and vary
together in the Earth system." NASA's Soil Moisture Active-
Passive mission is scheduled to be launched in December 2012.
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