Gizmorama
October 15, 2009
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Good Morning,
NASA scientists have recalculated the path of a giant
asteroid and have determined that it is unlikely that
it will collide with us. Read all about this study in
the last article.
Until Tomorrow,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
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Nanoparticles give solar cells a boost
COLUMBUS, Ohio - Ohio State University scientists say they
are using silver nanoparticles in research designed to lead
to lighter, cheaper and more flexible solar cells. The sci-
entists say they're experimenting with polymer semiconduc-
tors that absorb the sun's energy and generate electricity.
They report discovering that adding tiny bits of silver to
the plastic boosts the materials' electrical current gener-
ation. The team, led by physics Professor Paul Berger, said
it measured the amount of light absorbed by an experimental
solar cell polymer with and without silver nanoparticles.
They also measured the solar cell's current density -- the
amount of electrical current generated per square centi-
meter. The scientists said without silver, the material
generated 6.2 milliamps per square centimeter. With silver,
it generated 7.0 milliamps -- an increase of nearly 12 per-
cent. Berger said the small silver particles help the poly-
mer capture a wider range of wavelengths of sunlight than
would normally be possible, which in turn increases the
current output. He said the technology could eventually go
a long way toward making polymer solar cells commercially
viable. The study is reported in the early online edition
of the journal Solar Energy Materials and Solar Cells.
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New giant ring discovered around Saturn
PASADENA, Calif. - The U.S. space agency says its Spitzer
Space Telescope has discovered another ring around Saturn
-- a giant ring, with material covering millions of miles.
NASA said the newly discovered belt -- by far the largest
of the giant planet's many rings -- is located at the far
reaches of the Saturnian system, with an orbit tilted 27
degrees from the main ring plane. "The bulk of its material
starts about 3.7 million miles from the planet and extends
outward roughly another 7.4 million miles," the space agency
said in a statement. "One of Saturn's farthest moons, Phoebe,
circles within the newfound ring, and is likely the source
of its material." Astronomers say the ring's vertical height
is about 20 times the diameter of the planet and it would
take about one billion Earths stacked together to fill the
ring. "This is one supersized ring," said Anne Verbiscer, an
astronomer at the University of Virginia-Charlottesville.
"If you could see the ring, it would span the width of two
full moons' worth of sky, one on either side of Saturn." NASA
said the ring is so diffuse, it reflects little sunlight or
visible light. But its particles shine with infrared light
that Spitzer was able to observe. Verbiscer and Michael
Skrutskie of the University of Virginia and Douglas Hamilton
of the University of Maryland report the discovery in the
early online edition of the journal Nature.
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NASA: Asteroid not a hazard to Earth
PASADENA, Calif. - NASA scientists say they have recalculated
the path of a large asteroid and found a significantly re-
duced likelihood of an encounter with Earth in 2036. The
space agency said the Apophis asteroid is approximately the
size of 2 1/2 football fields. "Apophis has been one of
those celestial bodies that has captured the public's inter-
est since it was discovered in 2004," said NASA scientist
Steve Chesley. "Updated computational techniques and newly
available data indicate the probability of an Earth encounter
on April 13, 2036, for Apophis has dropped from one-in-45,000
to about four-in-a million." A majority of the data came from
observations made by Dave Tholen and collaborators at the
University of Hawaii's Institute for Astronomy in Manoa.
Tholen made improved measurements of the asteroid's position,
enabling him to provide NASA with new data sets more precise
than previous measures for Apophis, officials said Among
the findings is another close encounter by the asteroid with
Earth in 2068, with chance of impact currently at approxi-
mately three-in-a-million. Chesley and NASA scientist Paul
Chodas are to present their updated findings Thursday in
Puerto Rico during a meeting of the American Astronomical
Society's Division for Planetary Sciences.
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