Gizmorama
August 2, 2010
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Good Morning,
Technical problems on the International Space Station alarm
crew members. The problem, which is with the cooling system,
is being systematically fixed by the crew. You can read the
details on the problems in the second article.
Until Next Time,
Erin
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Satellites get new 'lives,' new jobs
HOUSTON - Two Earth-orbiting satellites scheduled to "die"
this year have been given a reprieve and sent to the moon to
do more science, researchers say. The two are part of a
fleet of five satellites launched by NASA in 2007 to study
the space storms that cause the northern and southern lights,
or auroras, on Earth, NewScientist.com reported Thursday.
Two of the solar-powered satellites, if left in their Earth
orbits, would have entered a long period in our planet's
shadow in March, fatally draining their batteries, scientists
said. So NASA scientists gave each a slight nudge in late
2009 with their onboard thrusters that will see the satel-
lites eventually settle into new orbits around the moon,
where their instruments will be used to study tenuous gas
surrounding the moon called the exosphere and its interac-
tions with solar winds.
Cooling problems reported on space station
CAPE CANAVERAL, Fla. - A cooling system on the International
Space Station shut down following a power surge, but the
crew is in no danger, NASA reported Sunday. The crew was
sleeping when alarms sounded, warning them of problems, NASA
said on its Web site. It took the crew several hours to power
down non-critical equipment as it searched for reasons for a
power spike in what NASA called "Cooling Loop A." Afterward,
the rest of the crew went back to bed while American astro-
naut Tracy Caldwell Dyson continued searching for troubles
in the problematic cooling loop. NASA said a redundant
cooling loop is keeping the ISS in a proper configuration
and if it's needed, a new cooling pump stored on the station
can be installed. "It seems like we're in a sim right now,"
flight engineer Tracy E. Caldwell Dyson told NASA flight
controllers early Sunday morning. She was referring to
training simulations. Troubleshooting was to continue Sunday
"to keep the station in a stable configuration, including
the installation of a jumper cable to maintain proper cooling
to the Zarva module on the Russian segment," NASA said.
Scientists find chemical 'memory' molecule
TEL AVIV, Israel - Scientists in Israel say they've identi-
fied a chemical in the human brain that helps brain cells
store new memories and allows them to "stick." A study by
researchers at Tel Aviv University says a natural molecule
occurring in the brain, called Aminobutyric acid, could be
the main factor in regulating how many new memories one can
generate and permanently store, a university release said
Thursday. Memories are stored in highly variable synaptic
connections between neurons in the brain, study leader Dr.-
Inna Slutsky said, and the variability ultimately deter-
mines whether and how memories are stored. The key to the
variability is the naturally occurring GABA, Slutsky said.
Higher concentrations of GABA near a synapse induced a
stronger activation of its receptors. As a result, GABA
makes this synapse more liable to the formation of new mem-
ories, she said.
'Dwarf' star could yield solar system clue
TUCSON - Scientists say the recent discovery of a brown
dwarf star, essentially a "failed" star, could shed light on
the early stages of solar system formation. Astronomers in
Chile, using an infrared telescope, Chile made the rare find
of the brown dwarf in orbit around a nearby young sun-like
star, a University of Arizona release said Thursday. The
host star, called PZ Tel A, is a younger version of our sun,
having a similar mass but a very young age of only 12 million
years, about 400 times younger than the sun. What makes the
discovery special, astronomers say, is the closeness of the
brown dwarf, PZ Tel B, to its companion star. It orbits at a
distance comparable to the orbit of Jupiter around our own
sun. This makes the PZ Tel system an important laboratory
for studying the early stages of solar system formation,
researchers say. PZ Tel B's orbital motion has significant
implications for what types of planets can form, and whether
planets can form at all, in similar solar systems, they say.
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