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Author Topic: Science Photo of the Week  (Read 467590 times)

Offline neilep

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Case of Sedna's missing moon reported solved
HARVARD-SMITHSONIAN CENTER FOR ASTROPHYSICS NEWS RELEASE


When the distant planetoid Sedna was discovered on the outer edges of our solar system,
 it posed a puzzle to scientists. Sedna appeared to be spinning very slowly compared to most
solar system objects, completing one rotation every 20 days. Astronomers hypothesized that
 this world possessed an unseen moon whose gravity was slowing Sedna's spin. Yet Hubble
Space Telescope images showed no sign of a moon large enough to affect Sedna.



CfA astronomer Scott Gaudi and his colleagues have
solved the case of Sedna's missing moon. That distant solar system
world (shown in this artist's conception) spins more rapidly than
originally thought, rotating once every 10 hours. Although Sedna is
unusual in many other ways, its rotation period is normal, meaning
 that no moon is required to slow it down. Credit: David A. Aguilar
(CfA)


New measurements by Scott Gaudi, Krzysztof (Kris) Stanek and colleagues at the Harvard-Smithsonian
 Center for Astrophysics (CfA) have cleared up this mystery by showing that a moon wasn't needed
after all. Sedna is rotating much more rapidly than originally believed, spinning once on its axis
every 10 hours. This shorter rotation period is typical of planetoids in our solar system,
 requiring no external influences to explain.

"We've solved the case of Sedna's missing moon. The moon didn't vanish because it was never
 there to begin with," said Gaudi.

Sedna is an odd world whose extreme orbit takes it more than 45 billion miles from the Sun,
or more than 500 astronomical units (where one astronomical unit is the average Earth-Sun distance
of 93 million miles). Sedna never approaches the Sun any closer than 80 astronomical units,
 and takes 10,000 years to complete one orbit. In comparison, Pluto's 248-year-long oval
 orbit takes it between 30 and 50 astronomical units from the Sun.

SOURCE: SPACEFLIGHTNOW.COM


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Space explosions may have triggered extinction on Earth

NASA NEWS RELEASE


Scientists at NASA and the University of Kansas say that a mass extinction on Earth hundreds
 of millions of years ago could have been triggered by a star explosion called a gamma-ray burst.
 The scientists do not have direct evidence that such a burst activated the ancient extinction.
 The strength of their work is their atmospheric modeling -- essentially a "what if" scenario.


In this artist's conception we see the gamma rays
hitting the Earth's atmosphere. The gamma rays would destroy the
 ozone layer, breaking apart and ultimately converting ozone
molecules into brown, smog-like nitrogen dioxide. Credit: NASA


The scientists calculated that gamma-ray radiation from a relatively nearby star explosion,
hitting the Earth for only ten seconds, could deplete up to half of the atmosphere's protective
 ozone layer. Recovery could take at least five years. With the ozone layer damaged,
ultraviolet radiation from the Sun could kill much of the life on land and near the surface
of oceans and lakes, and disrupt the food chain.

Gamma-ray bursts in our Milky Way galaxy are indeed rare, but the scientists estimate that
at least one nearby likely hit the Earth in the past billion years. Life on Earth is thought
 to have appeared at least 3.5 billion years ago. This research, supported by a NASA
astrobiology grant, represents a thorough analysis of the "mass extinction" hypothesis
 first announced by members of this science team in September 2003.

SOURCE:SPACEFLIGHTNOW.COM



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« Last Edit: 17/04/2005 18:33:17 by neilep »
 

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Classic galaxy with glamour

NASA/JPL PHOTO RELEASE



Credit: NASA/JPL-Caltech/OCIW
Download larger image version here




This color composite image of nearby NGC 300 combines the visible-light pictures from
Carnegie Institution of Washington's 100-inch telescope at Las Campanas Observatory
(colored red and yellow), with ultraviolet views from NASA's Galaxy Evolution Explorer.
Galaxy Evolution Explorer detectors image far ultraviolet light (colored blue).

This composite image traces star formation in progress. Young hot blue stars dominate the
outer spiral arms of the galaxy, while the older stars congregate in the nuclear regions which
appear yellow-green. Gases heated by hot young stars and shocks due to winds from massive stars
and supernova explosions appear in pink, as revealed by the visible-light image of the galaxy.

Located nearly 7 million light years away, NGC 300 is a member of a nearby group of galaxies
known as the Sculptor Group. It is a spiral galaxy like our own Milky Way.



SOURCE:SPACEFLIGHTNOW.COM


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« Last Edit: 19/04/2005 19:26:38 by neilep »
 

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Egg-Citing Discovery: Dinosaur fossil includes eggshells


Sid Perkins

For the first time, scientists have found eggs with shells inside a dinosaur fossil,
strengthening previous conjectures about the ancient reptiles' reproductive physiology.




READY TO GO. This fossil egg, one of two found in a female dinosaur's pelvic cavity, retains its shell and external texture.
Y.-N. Cheng


The dinosaur remains were unearthed in southern China from petrified sediments laid down
between 100 million and 65 million years ago. The fragmentary fossil includes six back
vertebrae, two adjacent tail vertebrae, and other bones from the dinosaur's pelvic
area, says Tamaki Sato of the Canadian Museum of Nature in Ottawa.

The remains were too scant to assign to a particular species but enough for Sato and
her colleagues to identify the creature generally as an oviraptorosaur,
 a member of a group of dinosaurs that includes the feathered Caudipteryx

SOURCE: SCIENCENEWSONLINE



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Stunning view of Saturn's moon Enceladus

CASSINI PHOTO RELEASE



Credit: NASA/JPL/Space Science Institute
Download larger image version here


Saturn's bright moon Enceladus hovers here, in front of rings darkened by Saturn's shadow. Enceladus is 505 kilometers (314 miles) across.

This view is from less than one degree beneath the ring plane. If seen from directly
beneath the rings, the planet's giant shadow would appear as an elongated half-ellipse;
the acute viewing angle makes the shadow look more like a strip here. The dark shadow
 first takes a bite out of the rings at the right, where the distant, outermost
ring material appears to taper and fade.

Ring features visible in this image from the outer ring edge inward include: the A ring,
 the Cassini Division and the B ring. The C ring is the darker region that dominates
the rings here. The two gaps visible near the center and below the left of the center are
 the Titan Gap, about 77,800 kilometers (48,300 miles) from Saturn, and an unnamed gap
about 75,800 kilometers (47,100 miles) from the planet.


SOURCE:SPACEFLIGHTNOW.com


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Offline Andrew K Fletcher

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This amazing photo, taken by Michael Clancy and originally published in USA Today and The Tennessean on September 7, 1999, is authentic. It began circulating via email within weeks of its first appearance in newspapers.  
It should be "The Picture of the Year," or perhaps, "Picture of the Decade." It won't be. In fact, unless you obtained a copy of the paper, you probably never saw it. The picture is that of a 21-week-old unborn baby named Samuel Alexander Armas, who is being operated on by a gifted surgeon named Joseph Bruner.

The baby was diagnosed with spina bifida and would not survive if removed from his mother's womb. Little Samuel's mother, Julie Armas, is an obstetrics nurse from Atlanta, and she had heard of
Dr. Bruner's remarkable
surgical talents.


It should be "The Picture of the Year," or perhaps, "Picture of the Decade." It won't be. In fact, unless you obtained a copy of the paper, you probably never saw it. The picture is that of a 21-week-old unborn baby named Samuel Alexander Armas, who is being operated on by a gifted surgeon named Joseph Bruner.

The baby was diagnosed with spina bifida and would not survive if removed from his mother's womb. Little Samuel's mother, Julie Armas, is an obstetrics nurse from Atlanta, and she had heard of
Dr. Bruner's remarkable
surgical talents.

Large version http://www.michaelclancy.com/main_lrg.htm

Death is natures way of telling us to slow down.
« Last Edit: 24/04/2005 14:52:15 by Andrew K Fletcher »
 

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Trap-building ants torture prey

A fierce species of Amazonian ant has been seen building elaborate traps on which hapless
 prey are stretched like medieval torture victims, before being slowly hacked to pieces.




With cunning and patience, the ants cut hairs from the
 stem of the plant they inhabit, and use the tiny fibres to build a
spongy platform. The elaborate trap snares its prey, which is then
stretched like a victim on a mediaeval rack before being hacked to
pieces.



With cunning and patience, Allomerus decemarticulatus worker-ants cut hairs from the stem of
 the plant they inhabit, and use the tiny fibres to build a spongy snare, Nature magazine reports.
This ingenious feat of engineering has only ever been observed in one other species of
related ant, French researchers say.
What the ants do is cut hairs to clear a path under the plant stem, while leaving some
hairs standing to form "pillars" on top of which the lethal platform will sit.
Using the plant hairs they have harvested, the ants weave the platform itself,
 which is bound together and strengthened using a special fungus.

When the ants have completed the chamber they puncture holes all along its surface,
each just big enough to poke their heads through.
Then, hundreds of
worker ants climb into the chamber and wait for an unfortunate victim.



There is no limit to the ants' ambition - they will try to catch any mammoth of the insect world

Ancient sacrifice

"Workers will hide inside the platform, with their mandibles just inside the hole and
they will wait there for prey to come," co-author Jerome Orivel of the University of Toulouse, France said.
Anything with legs slim enough to fit through the carefully constructed holes
 will meet a miserable fate if they are foolish enough to enter the trap.


"They will catch almost anything that goes on the trap," continued Dr Orivel. "And they will
 grab anything they can - legs, antenna, anything."
Once the prey is well
 secured by jaws fastening all its extremities, it is stretched over the platform like an ancient sacrifice to the gods.
Scores of worker
 ants then stream out from inside the trap and sting it vigorously to cause paralysis.

Once the creature is dead or fully immobilised, the ants will carry it to their nest, where they will dismember their prey before carrying it inside.

"Small insects will be immediately dismembered and transported to the nest," said
Dr Orivel. "But bigger insects will stay on the trap for up to 12 hours."
There is no limit to the ants' ambition and they will attempt to catch any mammoth
of the insect world - so long as it has slender legs.

"Their success depends on the type of insect," Dr Orivel told the BBC News website.
 "The insects' legs have to be smaller than the holes otherwise they cannot get hold of them.

"The ants must have something to catch - for example, caterpillars will have nothing to
get hold of so they will not be preyed upon."

SOURCE: BBC










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Cassini produces three stunning new views of Titan

CASSINI PHOTO RELEASE





Credit: NASA/JPL/Space Science Institute
Download larger image version here


These three views of Titan from the Cassini spacecraft illustrate how different the same
place can look in different wavelengths of light. Cassini's cameras have numerous filters
 that reveal features above and beneath the shroud of Titan's atmosphere.

The first image, a natural color composite, is a combination of images taken through
three filters that are sensitive to red, green and violet light. It shows approximately
what Titan would look like to the human eye: a hazy orange globe surrounded by a tenuous,
 bluish haze. The orange color is due to the hydrocarbon particles which make up Titan's atmospheric haze.

The second, monochrome view shows what Titan looks like at 938 nanometers, a near-infrared
 wavelength that allows Cassini to see through the hazy atmosphere and down to the surface.

The third view, which is a false-color composite, was created by combining two infrared images
(taken at 938 and 889 nanometers) with a visible light image (taken at 420 nanometers).
Green represents areas where Cassini is able to see down to the surface. Red represents
areas high in Titan's stratosphere where atmospheric methane is absorbing sunlight.
Blue along the moon's outer edge represents visible violet wavelengths at which
 the upper atmosphere and detached hazes are better seen.

SOURCE: SPACEFLIGHTNOW.COM

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The Whirlpool Galaxy and companion

SPACE TELESCOPE SCIENCE INSTITUTE NEWS RELEASE



Credit: NASA, ESA, and The Hubble Heritage Team (STScI/AURA)
Download larger image version here


The graceful, winding arms of the majestic spiral galaxy M51 (NGC 5194) appear like a grand
spiral staircase sweeping through space. They are actually long lanes of stars and gas
laced with dust.

This sharpest-ever image of the Whirlpool Galaxy, taken in January 2005 with the Advanced Camera
for Surveys aboard NASA's Hubble Space Telescope, illustrates a spiral galaxy's grand design,
 from its curving spiral arms, where young stars reside, to its yellowish central core, a home
 of older stars. The galaxy is nicknamed the Whirlpool because of its swirling structure.

The Whirlpool's most striking feature is its two curving arms, a hallmark of so-called
grand-design spiral galaxies. Many spiral galaxies possess numerous, loosely shaped arms which
 make their spiral structure less pronounced. These arms serve an important purpose in spiral
 galaxies. They are star-formation factories, compressing hydrogen gas and creating clusters
 of new stars. In the Whirlpool, the assembly line begins with the dark clouds of gas on the
inner edge, then moves to bright pink star-forming regions, and ends with the brilliant blue
 star clusters along the outer edge.

SOURCE:SPACEFLIGHTNOW.COM

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Hubble shows stellar spire in the Eagle Nebula

SPACE TELESCOPE SCIENCE INSTITUTE NEWS RELEASE




Credit: NASA, ESA, and The Hubble Heritage Team (STScI/AURA)
Download larger image version here


Appearing like a winged fairy-tale creature poised on a pedestal, this object is actually
 a billowing tower of cold gas and dust rising from a stellar nursery called the
Eagle Nebula. The soaring tower is 9.5 light-years or about 57 trillion miles high,
about twice the distance from our Sun to the next nearest star.

Stars in the Eagle Nebula are born in clouds of cold hydrogen gas that reside in chaotic
 neighborhoods, where energy from young stars sculpts fantasy-like landscapes in the gas.
 The tower may be a giant incubator for those newborn stars. A torrent of ultraviolet
 light from a band of massive, hot, young stars [off the top of the image] is eroding the pillar.

The starlight also is responsible for illuminating the tower's rough surface. Ghostly streamers
of gas can be seen boiling off this surface, creating the haze around the structure and
highlighting its three-dimensional shape. The column is silhouetted against the background
 glow of more distant gas.

SOURCE:SPACEFLIGHTNOW.COM




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Cassini finds particles near Saturn's moon Enceladus
NASA/JPL NEWS RELEASE
Posted: April 26, 2005

The Cassini spacecraft has discovered intriguing dust particles around Saturn's
moon Enceladus. The particles might indicate the existence of a dust cloud around Enceladus,
or they may have originated from Saturn's outermost ring, the E-ring.


Credit: NASA/JPL/Space Science Institute
Download larger image version here


Enceladus is rapidly becoming a very interesting target for Cassini. So much so that scientists
 and engineers are planning to revise the altitude of the next flyby to get a closer look.
 Additional Cassini encounters with Enceladus are scheduled for July 14, 2005, and March 12, 2008.
The July 14 flyby was to be at an altitude of 1,000 kilometers (620 miles), but the mission
team now plans to lower that altitude to about 175 kilometers (109 miles). This will be
Cassini's lowest-altitude flyby of any object during its nominal four-year tour.

Scientists have speculated that Enceladus is the source of Saturn's E ring, the planet's widest,
 stretching 302,557 kilometers (188,000 miles). It's possible, the scientists say, that tidal
 interactions between Enceladus and Mimas, two other moons of Saturn, have heated Enceladus'
 interior causing water volcanism

SOURCE:SPACEFLIGHTNOW.COM




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'Wonderful' star reveals its hot nature

CHANDRA X-RAY CENTER NEWS RELEASE


For the first time an X-ray image of a pair of interacting stars has been made by NASA's
Chandra X-ray Observatory.



The Chandra image shows Mira A (right), a highly
evolved red giant star, and Mira B (left), a white dwarf. To the
right of the image is an artist's conception of the Mira star
system. Mira A is losing gas rapidly from its upper atmosphere via a
stellar wind. Mira B exerts a gravitational tug that creates a
gaseous bridge between the two stars. Gas from the wind and bridge
accumulates in an accretion disk around Mira B and collisions
between rapidly moving particles in the disk produce X-rays. Credit:
X-ray: NASA/CXC/SAO/M. Karovska et al.; Illustration: CXC/M.Weiss


SOURCE: SPACEFLIGHTNOW.COM     Other sauces, Soy, Strawberry , raspberry, Mustard and Ketchup....all good sauces.:)


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Saturn's Odd Moon Out
by Amit Asaravala

Scientists this week got two steps closer to proving that Saturn
adopted one of its 34 known moons, thanks to two new studies of data
captured by NASA's Cassini spacecraft.


The studies, which explore the density and chemistry of the moon
Phoebe, show how the moon is closer in composition to the mysterious
 balls of ice and rock at the outer edges of the solar system than
it is to Saturn's other moons.


New studies support the theory that Saturn's moon
Phoebe was captured from the outer solar system by the planet's
gravitational pull rather than formed in place. The discovery gives
scientists the chance to study an object that has not changed much
since the birth of the solar system.

Photo: NASA/JPL/Space Science Institute


The results add weight to the theory that Phoebe is a planetary
building-block left over from the birth of the solar system -- a
rare find that may give scientists insight into how the solar system
was formed.


"If Phoebe is a body that came from the deep outer solar system --
if it formed farther out and was captured -- that's giving us a
snapshot of what was going on early on," said the density study's
 co-author Jonathan Lunine, a planetary scientist at the University of
Arizona.


SOURCE: www.wired.com

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« Last Edit: 05/05/2005 03:23:50 by neilep »
 

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Cassini shows amazing icy moons of Saturn

CASSINI PHOTO RELEASE


Credit: NASA/JPL/Space Science Institute
Download larger image version here


A scene straight out of science fiction, this fantastic view shows, from left to right,
 Saturn's moon's Mimas, Dione and Rhea, on the far side of Saturn's nearly edge-on rings.


The trailing hemispheres of all three moons are sunlit here, and wispy markings can
 be seen on the limbs of both Dione and Rhea. The diameter of Mimas is 397 kilometers (247 miles),
Dione is 1,118 kilometers (695 miles) and Rhea is 1,528 kilometers (949 miles).

The image was taken in visible blue light with the Cassini spacecraft narrow-angle
camera at a distance of approximately 2.4 million kilometers (1.5 million miles) from Saturn.
 The image scale is 14 kilometers (9 miles) per pixel.

SOURCE:SPACEFLIGHTNOW.COM

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Spitzer observatory spies spectacular Sombrero
NASA/JPL PHOTO RELEASE


NASA's Spitzer Space Telescope set its infrared eyes on one of the most famous objects
 in the sky, Messier 104, also called the Sombrero galaxy. In this striking infrared picture,
 Spitzer sees an exciting new view of a galaxy that in visible light has been likened to
a "sombrero," but here looks more like a "bulls-eye."




Credit: NASA/JPL-Caltech/University of Arizona/STScI; NASA/STScI/AURA
Download larger image version
here

The new picture of Messier 104 combines a recent infrared observation from NASA's
Spitzer Space Telescope with a well-known visible light image from the Hubble Space Telescope.
 In the Hubble Space Telescope's visible light image (lower left panel), only the near rim
 of dust can be clearly seen in silhouette. Recent observations using Spitzer's infrared
array camera (lower right panel) uncovered the bright, smooth ring of dust circling the galaxy,
 seen in red. Spitzer's infrared view of the starlight, pierced through the obscuring dust,
 is easily seen, along with the bulge of stars and an otherwise hidden disk of stars within
the dust ring.



Viewed from Earth, the Sombrero galaxy is seen nearly edge-on, just six degrees away from
its equatorial plane. This spiral galaxy is located 28 million light years away and is 50,000
light-years across. The Sombrero is one of the most massive objects at the southern edge
of the Virgo cluster of galaxies, and is equal in size to 800 billion Suns. It hosts
 a rich system of nearly 2,000 globular clusters, 10 times as many as orbit our Milky Way galaxy.
 It is also interesting that the Sombrero galaxy may harbor a super-massive black hole,
accounting for the electromagnetic glow emitted from its center.

SOURCE: SPACEFLIGHTNOW.com

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First full mosaics of Titan’s surface




Stereographic projection of Titan's surface seen from Huygens

bigger picture here

13 May 2005
As the large amount of data collected by the ESA Huygens probe during its descent onto
 Titan is being processed, new views of this fascinating world become available.
 
The Descent Imager Spectral Radiometer (DISR) team have now produced the first complete
 ‘stereographic’ and ‘gnomonic’ mosaic images. Using special image projection techniques,
the team combined a series of images captured by Huygens while rotating on its axis
at an altitude of about 20 kilometres.

SOURCE: European Space Agency

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Canadian astronomers look deep into stellar cocoon

GEMINI OBSERVATORY NEWS RELEASE


Using a giant telescope on Mauna Kea Hawaii is a dream for most amateur sky watchers.
 Recently a Canadian amateur astronomy group took advantage of a rare opportunity and
used one of the largest telescopes in the world, the Gemini 8-meter telescope, to look more
deeply into the remains of a particular stellar nursery than anyone ever has.




Gemini North image of stellar nursery RY Tau was
imaged by the Gemini Multi-Object Spectrograph (GMOS) as part of a
Canadian contest for amateur astronomers. The image reveals
tremendous detail in the wispy remains of the gas cloud that formed
the bright star at bottom/center.


Download larger image version here

The observations of a star emerging from its cocoon were the result of a proposal submitted
 as part of a nationwide contest in Canada. The winning group from Quebec received its data/images
during a special ceremony at the annual meeting of the Canadian Astronomical Society at
 the University of Montreal on Sunday May 15, 2005.

"Our group knew that this object was unique and hadn’t been observed in detail with a big
telescope like Gemini," said Gilbert St-Onge, the club member who submitted the proposal.
 "I feel like we’ve not only made a pretty picture, but probably provided some new and valuable
 data for the pros!"

SOURCE:SPACEFLIGHTNOW.COM


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I have a hobby of collecting photos of rocks, stones, and trees that resemble human faces and bodies. One day I will upload them to a website for everyone's amusement. Here are a few of the appropriate ones.
The first one is a piece of petrified wood enveloped within a dead tree I found on the beach of Hornby Island, Canada.
The second I call the "petrified Chinaman", photographed on a black neoprene scuba dry-suit.
The third is a tree twisted to resemble a man's legs and waist, complete with a penis. Not set up, this was how I found it laying!
 

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Deep Impact is a smashing success

BY WILLIAM HARWOOD
STORY WRITTEN FOR CBS NEWS "SPACE PLACE"


PASADENA, Calif. (CBS) - A scientific smart bomb crashed into Comet
Tempel 1 early today, blasting a sparkling shower of icy debris into
 space in a 23,000-mph Fourth of July spectacular 83 million miles
from Earth.



This image shows the initial ejecta that resulted when
 NASA's Deep Impact probe collided with comet Tempel 1 at 1:52 a.m.
 EDT. The picture was taken by the mothership's medium-resolution
camera 16 seconds after impact. Credit: NASA/JPL-Caltech/UMD


"Jeez, and we thought it was going to be subtle!" marveled comet expert Donald Yeomans
 as images of the impact were received at the Jet Propulsion Laboratory. "We've had a
 far bigger explosion than we anticipated. ... I can't imagine how this could go any better."


Said Rick Grammier, the Deep Impact project manager: "It came together quite well, just
 phenomenal. It went very much like clockwork. We didn't exercise a single contingency plan."


As it closed in on Tempel 1 at 11 times the speed of a rifle bullet, the impactor beamed back
a stream of ever more detailed pictures, showing circular craters, plain-like areas, a long,
 snaking ridge and jumbled-looking terrain similar to regions on the moon.

"It's illuminating some extremely interesting surface features," Yeomans said, describing
the pictures as they as they came in. "That's going to keep the scientists going for a
 long time. The navigation was perfect, it couldn't have been any better. The impact was
bigger than I expected, bigger than most of us expected. So this is going to tell us a great
deal about how this comet is put together."

SOURCE: SPACEFLIGHTNOW.COM


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DINOSAUR TRACK FOUND IN ALASKAN PARK




In this photo provided by the National Park Service, a track from a three-toed dinosaur
 thought to be about 70 million years old is measured June 2005 in Denali National Park ,
Alaska. The track of a theropod, a meat-eater, discovered by a University of Alaska
Fairbanks student is the first dinosaur evidence found in the park. (AP Photo/National Park Service )


SOURCE: YAHOO NEWS

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quote:
Originally posted by johndiver

I have a hobby of collecting photos of rocks, stones, and trees that resemble human faces and bodies. One day I will upload them to a website for everyone's amusement. Here are a few of the appropriate ones.
The first one is a piece of petrified wood enveloped within a dead tree I found on the beach of Hornby Island, Canada.
The second I call the "petrified Chinaman", photographed on a black neoprene scuba dry-suit.
The third is a tree twisted to resemble a man's legs and waist, complete with a penis. Not set up, this was how I found it laying!




Hi John, any chance of resubmitting your piccys ?...if you have a problem with posting them ,let me know...I have some experience.

Men are the same as women.... just inside out !!
 

Offline neilep

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Red Light-Flashing Jellyfish Lures Prey

WASHINGTON - The first deep sea red-light district — glowing
appendages on a newly discovered jellyfish relative — appear to
flash their come-hither message to lure prey.

Jellyfish and other types of sea creatures are known to produce
light, but this is the first deep ocean invertebrate known to use red fluorescent light, said Steven H. D. Haddock of the Monterey Bay
Aquarium Research Institute in Moss Landing, Calif.


Three of the animals were found by scientists using a remote
controlled research vehicle at depths of between 5,200 feet and
7,500 feet off the coast of California. The discovery is reported in
Friday's issue of the journal Science.





These undated images released by 'Science' show an
Erenna specimen, a deep sea relative of the jellyfish, found off the
 coast of California, and the first-know marine invertebrates to
produce red luminescent light. Top left, the Erenna specimen; bottom
 left, a partial view showing the fluorescing appendages or tentilla




SOURCE: ASSOCIATED PRESS VIA YAHOO NEWS

Wish I could make my appendages glow !!


Men are the same as women.... just inside out !!
« Last Edit: 08/07/2005 21:56:44 by neilep »
 

Offline memasa

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Northern lights

Nature's screensaver




SEE THIS LINK: http://www.fmi.fi/research_space/space_9.html
« Last Edit: 10/07/2005 12:30:11 by memasa »
 

Offline neilep

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Fundamental limitation to quantum computers

Quantum computers that store information in so-called quantum bits (or qubits) will be
confronted with a fundamental limitation. This is the claim made by Dutch theoretical
physicists from the Foundation for Fundamental Research on Matter (FOM) and Leiden
 University in an article recently published in the journal Physical Review Letters.

A quantum computer can only function if the information exists for long enough to be
processed. The so-called coherence of the qubit ensures that the quantum information
remains intact. The researchers have now discovered that the coherence spontaneously
disappears over the course of time and with this the stored information as well.
 This could pose a considerable problem for the development of a quantum computer.


Electron microscope image of a qubit from Hans Mooij's
research group at Delft University of Technology.


A quantum computer makes use of the fact that a quantum mechanical system -an electron,
 an atom or even a larger system such as a superconducting quantum bit - can simultaneously
 exist in two states. Normally one of the two states disappears as soon as the system comes
 into contact with the outside world. The coherence then disappears as a result of the
decoherence process and the information in a quantum bit is lost.

A quantum bit typically consists of a large number of particles, with an unavoidably
large number of possibilities to be influenced by the environment and thus be subjected
to decoherence. Jasper van Wezel, Jeroen van den Brink (FOM) and Jan Zaanen, all attached
 to the Lorentz Institute of Leiden University have now investigated whether it is possible
 to maintain the coherence in an isolated qubit.

Much to their surprise they discovered that the coherence tends to spontaneously disappear
, even without external influences. The degredation process is linked to the occurrence
 of quantum mechanical spontaneous symmetry breaking. In classical physics an equivalent
 example of this process is spontaneous crystallisation in a solution. At a certain
 position a crystal is spontaneously formed, as a result of which the fluid structure is broken.

According to the researchers' predictions, the coherence in some highly promising concepts
for qubits will disappear after about a second. Moreover, the smaller the qubits the
 faster that process occurs. All of this would seem to pose a fundamental limitation
on the development of qubits. Experimental research will now have to demonstrate whether
this phenomenon actually occurs.

SOURCE: NETHERLANDS ORGANISATION FOR SCIENTIFIC RESEARCH


Men are the same as women.... just inside out !!
 

Offline neilep

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Saturn fantasy made real
CASSINI NEWS RELEASE


Credit: NASA/JPL/Space Science Institute


Le grande image ici


The majesty of Saturn overwhelms in this image from Cassini.
Saturn's moon Tethys glides past in its orbit, and the icy rings
mask the frigid northern latitudes with their shadows. Tethys is
1,071 kilometers (665 miles) across.
 

The image was taken in visible green light with the Cassini spacecraft wide-angle camera at a distance of approximately 1.4
million kilometers (900,000 miles) from Saturn. The image scale is
80 kilometers (50 miles) per pixel.

SOUCE: SPACEFLIGHTNOW.COM





Men are the same as women.... just inside out !!
 

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