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Gizmorama - Phoenix spacecraft: On course for Mars
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Good Morning,
Microsoft is launching a site today that lets you virtual
explore the universe. It is a downloadable application and
you can get it by visiting www.WorldWideTelescope.org. Here
is a link to one article about the project...
http://www.nytimes.com/2008/05/13/science/13astr.html?ref=science
If you download the program, send me an email and let me know
how you liked it.
Until Tomorrow,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
Email your comments
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Phoenix spacecraft: On course for Mars
The U.S. space agency says its Phoenix Mars Lander is on course
for a May 25 landing on Mars. National Aeronautics and Space
Administration scientists targeted the spacecraft's certified
landing site with a trajectory correction maneuver April 10.
But, since then, officials say the spacecraft's performance
has been stable enough to allow Jet Propulsion Laboratory
controllers to skip a scheduled opportunity for an additional
trajectory correction maneuver May 10 and focus on the next
such opportunity Saturday. Phoenix has performed three flight
path corrections since its Aug. 4, 2007, launch. The final
opportunity for adjusting course will be during the final 24
hours before landing. NASA said the first possible confirmation
time for the spacecraft's May 25 landing will be at 4:53 p.m.
PDT. The event would have occurred 15 minutes and 20 seconds
earlier on Mars -- the time it takes radio signals traveling
at the speed of light to travel from Mars to Earth.
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New finding may explain some hearing loss
U.S. scientists said their findings about how sounds are
amplified in the inner ear might explain how genetic mutation
or drug-overdose hearing loss occurs. St. Jude Children's
Research Hospital investigators found an electrically powered
amplification mechanism in the cochlea of the ear is critical
to the acute hearing of humans and other mammals. Sound entering
the cochlea is detected by the vibration of tiny, hair-like
cilia that extend from cochlear hair cells, the scientists
said. While the cochlea's "inner hair cells" are only passive
detectors, the so-called outer hair cells amplify the sound
signal as it transforms into an electrical signal that travels
to the brain's auditory center, they said. Without such
amplification, hearing would be far less sensitive since
sound waves entering the cochlea are severely diminished as
they pass through the inner ear fluid. The research, which
included Jian Zuo, Xudong Wu, Jiangang Gao and Wendy Cheng
at St. Jude; Peter Dallos, Mary Ann Cheatham, Jing Zheng,
Charles Anderson and Soma Sengupta at Northwestern University;
and Shuping Jia, Xiang Wang and David He at Creighton
University, appears in the May 8 issue of the journal Neuron.
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Silicon can have good effect on sunflowers
U.S. horticulturists say they have determined silicon might
have a beneficial effect on ornamental sunflowers if delivered
in the correct concentration. Although silicon, a predominant
element in mineral soil, isn't considered an essential nutrient
for most plants, there has been limited evidence it might
affect the aesthetic qualities of ornamental flowers. Oklahoma
State University researchers Sophia Kamenidou and Todd Cavins
examined the effects of silicon supplements on sunflowers grown
in greenhouse environments. Cavins said the goal of the study
was to determine the effects of silicon supplementation on
the greenhouse-produced ornamental sunflower called "Ring of
Fire" (Helianthus annuus L.). The researchers found, depending
on the source and concentration of silicon used, several
horticultural traits improved as a result of silicon
supplementation. Kamenidou and Cavins said they observed thick,
straight stems, increased flower and stem diameters and increased
height in some of the treatments. "However, growth abnormalities
were observed when concentrations of silicon at 100 mg and 200
mg per liter were supplied as potassium silicate substrate
drenches," said Cavins. The research appeared in the February
issue of the journal HortScience and is available at
http://hortsci.ashspublications.org/cgi/content/abstract/43/1/236.
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