[net-gold] ASTRONOMY: NASA Spots First Planet in Binary Star System
- From: "David P. Dillard" <jwne@xxxxxxxxxx>
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- Date: Fri, 16 Sep 2011 07:18:47 -0400 (EDT)
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ASTRONOMY:
NASA Spots First Planet in Binary Star System
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NASA Spots First Planet in Binary Star System
By: William Harwood
September 15, 2011 4:50 PM PDT
CNET News
http://news.cnet.com/8301-19514_3-20106952-239/
nasa-spots-first-planet-in-binary-star-system/
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A shorter URL for the above link:
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http://tinyurl.com/3nl3phv
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NASA's Kepler space telescope, searching for planets around distant suns,
has discovered a Saturn-size world orbiting two stars 200 light years from
Earth, a long-sought "circumbinary" planet reminiscent of the fictional
world Tatooine in the Star Wars saga.
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"This is the first definitive detection of a circumbinary planet and the
best example we have of a Tatooine-type world," said Laurance Doyle, a
researcher at the SETI Institute's Carl Sagan Center for the Study of Life
in the Universe and lead author of a paper in the journal Science
describing the discovery.
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snip
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Launched in March 2008, Kepler trails the Earth in its orbit around the
sun, aiming a 95-megapixel camera at a patch of sky the size of an
out-stretched hand that contains more than 4.5 million detectable stars.
Of that total, some 300,000 are the right age, composition and brightness
to host Earth-like planets. Over the life of the mission, more than
150,000 of those will be actively monitored by Kepler.
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The spacecraft's camera does not take pictures like other space
telescopes. Instead, it acts as a photometer, continually monitoring the
brightness of candidate stars in its wide field of view, on the lookout
for the minute dimming that occurs when a planet passes in front of the
star.
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By studying subtle changes in brightness from such planetary
transits--comparable to watching a flea creep across acar's headlight at
night--and the timing of repeated cycles, computer analysis can identify
potential worlds in habitable-zone orbits.
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The probability of finding sun-like stars with Earth-like planets in
orbits similiar to ours--and aligned so that Kepler can "see" them--is
about one-half of 1 percent. But given the sample size, that still leaves
hundreds of potential discoveries.
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The complete article may be read at the URL above.
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Sincerely,
David Dillard
Temple University
(215) 204 - 4584
jwne@xxxxxxxxxx
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