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Telescope

Hinode satellite captures X-ray footage of solar eclipse

solar eclipse
© Center for Astrophysics
The moon passed between the Earth and the sun on Thursday, Oct. 23. While avid stargazers in North America looked up to watch the spectacle, the best vantage point was several hundred miles above the North Pole.

The Hinode spacecraft was in the right place at the right time to catch the solar eclipse. What's more, because of its vantage point, Hinode witnessed a "ring of fire" or annular eclipse.

An annular eclipse occurs when the moon passes directly in front of the sun but doesn't cover it completely because the moon appears too small. (The apparent size of the moon depends on its distance from Earth or, in this case, the spacecraft.) About one-third of all solar eclipses are annular.

"This is only the second annular eclipse Hinode has witnessed since it launched in 2006," says astrophysicist Patrick McCauley of the Harvard-Smithsonian Center for Astrophysics.
Airplane

Europe postpones next month's launch of first 'space plane'

ESA's space plane

A replica of the ESA's space plane IXV is on display during the presentation at the European Space Research and Technology Centre in Noordwijk, on September 9, 2014
Europe said Friday it was postponing the launch next month of its first-ever "space plane" to give scientists time to finetune the mission's flight plan.

Dubbed the IXV, for Intermediate eXperimental Vehicle, the plane had been scheduled for launch on November 18 by a Vega light rocket from Kourou, French Guiana.

"The European Space Agency (ESA), in conjunction with the French space agency CNES, has decided to carry out additional flight trajectory analyses," said Arianespace, which markets services by ESA's launchers.

"A new launch date will be announced as soon as possible," it said in a press release..
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Ebola's evolutionary roots are more ancient than previously thought

Ebola virus
© Credit: Frederick A. Murphy, via the Centers for Disease Control and Prevention
A colorized transmission electron micrograph (TEM) of the Ebola virus.
A new study is helping to rewrite Ebola's family history. The research shows that filoviruses - a family to which Ebola and its similarly lethal relative, Marburg, belong - are at least 16-23 million years old.

Filoviruses likely existed in the Miocene Epoch, and at that time, the evolutionary lines leading to Ebola and Marburg had already diverged, the study concludes.

The research was published in the journal PeerJ in September. It adds to scientists' developing knowledge about known filoviruses, which experts once believed came into being some 10,000 years ago, coinciding with the rise of agriculture. The new study pushes back the family's age to the time when great apes arose.

"Filoviruses are far more ancient than previously thought," says lead researcher Derek Taylor, PhD, a University at Buffalo professor of biological sciences. "These things have been interacting with mammals for a long time, several million years."

According to the PeerJ article, knowing more about Ebola and Marburg's comparative evolution could "affect design of vaccines and programs that identify emerging pathogens."

The research does not address the age of the modern-day Ebolavirus. Instead, it shows that Ebola and Marburg are each members of ancient evolutionary lines, and that these two viruses last shared a common ancestor sometime prior to 16-23 million years ago.
Blackbox

Do quantum effects emerge from many interacting [classical] worlds?

many worlds bizarre
© Elena Kulikova/Getty Images
Parallel universes - worlds where the dinosaur-killing asteroid never hit, or where Australia was colonised by the Portuguese - are a staple of science fiction. But are they real?

In a radical paper published this week in Physical Review X, we (Dr Michael Hall and I from Griffith University and Dr Dirk-André Deckert from the University of California) propose not only that parallel universes are real, but that they are not quite parallel - they can "collide".

In our theory, the interaction between nearby worlds is the source of all of the bizarre features of quantum mechanics that are revealed by experiment.
Fireball 4

Asteroid 2014 SC324 zips by Earth Friday afternoon

Asteroid 2014 SC324
© Gianluca Masi/Software Bisque
Here comes another asteroid! 2014 SC324 will miss Earth by 1.5 times the distance to the Moon early Friday afternoon October 24, 2014.
What a roller coaster week it's been. If partial eclipses and giant sunspots aren't your thing, how about a close flyby of an Earth-approaching asteroid? 2014 SC324 was discovered on September 30 this year by the Mt. Lemmon Survey high in the Catalina Mountains north of Tucson, Arizona.

Based on brightness, the tumbling rock's size is estimated at around 197 feet (60-m), on the large side compared to the many small asteroids that whip harmlessly by Earth each year.
Telescope

Illusions in the cosmic clouds: New image of spinning neutron star

Pareidolia is the psychological phenomenon where people see recognizable shapes in clouds, rock formations, or otherwise unrelated objects or data. There are many examples of this phenomenon on Earth and in space.

Nebulous
© NASA/CXC/SAO
Do you see any recognizable shapes in this nebulous region captured by NASA's WISE and Chandra missions?
When an image from NASA's Chandra X-ray Observatory of PSR B1509-58 -- a spinning neutron star surrounded by a cloud of energetic particles --was released in 2009, it quickly gained attention because many saw a hand-like structure in the X-ray emission.

In a new image of the system, X-rays from Chandra in gold are seen along with infrared data from NASA's Wide-field Infrared Survey Explorer (WISE) telescope in red, green and blue. Pareidolia may strike again as some people report seeing a shape of a face in WISE's infrared data. What do you see?

NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR, also took a picture of the neutron star nebula in 2014, using higher-energy X-rays than Chandra.

PSR B1509-58 is about 17,000 light-years from Earth.
Telescope

NASA identifies ice cloud above cruising altitude on Titan

NASA scientists have identified an unexpected high-altitude methane ice cloud on Saturn's moon Titan that is similar to exotic clouds found far above Earth's poles.

Titan
© L. NASA/JPL
This cloud in the stratosphere over Titan's north pole (left) is similar to Earth's polar stratospheric clouds (right). NASA scientists found that Titan's cloud contains methane ice, which was not previously thought to form in that part of the atmosphere. Cassini first spotted the cloud in 2006.
This lofty cloud, imaged by NASA's Cassini spacecraft, was part of the winter cap of condensation over Titan's north pole. Now, eight years after spotting this mysterious bit of atmospheric fluff, researchers have determined that it contains methane ice, which produces a much denser cloud than the ethane ice previously identified there.

"The idea that methane clouds could form this high on Titan is completely new," said Carrie Anderson, a Cassini participating scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland, and lead author of the study. "Nobody considered that possible before."

Methane clouds were already known to exist in Titan's troposphere, the lowest layer of the atmosphere. Like rain and snow clouds on Earth, those clouds form through a cycle of evaporation and condensation, with vapor rising from the surface, encountering cooler and cooler temperatures and falling back down as precipitation. On Titan, however, the vapor at work is methane instead of water.
Info

Real-life tractor beam pulls in particles

The Millennium Falcon
© Fair Use, Screengrab/Lucas Film
The Millennium Falcon in Star Wars Episode IV: A New Hope.
The invisible force that pulls in the Millennium Falcon spacecraft to the Death Star in Star Wars movies is still far from becoming a reality, but physicists have developed a miniature version of sorts: a tractor beam that can reel in tiny particles.

The laser-based retractor beam pulled the particles a distance of about 8 inches (20 centimeters), which is 100 times farther than any previous experiments with tractor beams.

"Because lasers retain their beam quality for such long distances, this could work over meters," study researcher Vladlen Shvedov, research fellow at the Australian National University, said in a statement. "Our lab just was not big enough to show it."

During the experiment, the researchers used a laser that projected a doughnut-shaped beam of light with a hot outer ring and cool center. They used the light beam to suck in tiny glass spheres, each of which measured about 0.2 millimeters (0.008 inches) wide.

Not only did the researchers move the glass spheres farther than had been demonstrated in previous experiments, but they used a different technique altogether. Other retractor beams rely on the momentum of light particles in the laser beam to reel in mass. In those experiments, the momentum from the light particles shooting out of the laser is transferred to the target that the laser is hauling in. However, that technique works well only in a vacuum that is shielded from other free-floating particles that can interfere with the momentum transfer.
Bulb

Electrostatic force microscopy (EFM) shows electric charge propagating along microbial nanowires

Geobacter
© Credit: UMass Amherst
UMass Amherst researchers recently provided stronger evidence than ever before to support their claim that the microbe Geobacter produces tiny electrical wires, called microbial nanowires, along which electric charges propagate just as they do in carbon nanotubes, a highly conductive man-made material.
The claim by microbiologist Derek Lovley and colleagues at the University of Massachusetts Amherst that the microbe Geobacter produces tiny electrical wires, called microbial nanowires, has been mired in controversy for a decade, but the researchers say a new collaborative study provides stronger evidence than ever to support their claims.

UMass Amherst physicists working with Lovley and colleagues report in the current issue of Nature Nanotechnology that they've used a new imaging technique, electrostatic force microscopy (EFM), to resolve the biological debate with evidence from physics, showing that electric charges do indeed propagate along microbial nanowires just as they do in carbon nanotubes, a highly conductive man-made material.

Physicists Nikhil Malvankar and Sibel Ebru Yalcin, with physics professor Mark Tuominen, confirmed the discovery using EFM, a technique that can show how electrons move through materials. "When we injected electrons at one spot in the microbial nanowires, the whole filament lit up as the electrons propagated through the nanowire," says Malvankar.

Yalcin, now at Pacific Northwest National Lab, adds, "This is the same response that you would see in a carbon nanotube or other highly conductive synthetic nanofilaments. Even the charge densities are comparable. This is the first time that EFM has been applied to biological proteins. It offers many new opportunities in biology."

Comment: see also: Forming new circuits - Meet the electric life forms that live on pure energy

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Ten years on, scientists still debating the origins of Homo floresiensis - the 'Hobbit'

Homo floresiensis
© John Gurche/National Museum of Natural History
Homo floresiensis adult female - model of head.
It's been ten years since the bones of Homo floresiensis, aka, the "hobbit" were uncovered in Liang Bua, a cave, on the island of Flores in Indonesia, and scientists still can't agree on the diminutive hominin's origins.

This month, the journal Nature has printed a comment piece by Chris Stringer of the Natural History Museum in London and two pieces by Ewen Callaway, one a retrospective with interviews with the central players, and the other a podcast with the four principle scientists involved in the find - Bert Roberts, Thomas Sutikna, Dean Falk, and Stringer.

Did H. floresiensis descend from Australopithecus, leaving Africa and somehow settling on Flores, or was it a case of an early member of our family tree finding its way to the island and then because of limited resources, evolving into a much smaller size? That's the central question in the debate.

The majority opinion has sided with the island effect, mostly because of the time frame - H. floresiensis existed a mere 13,000 years ago, which means it was alive when other Homo sapiens were about, thus it seemed to make sense that H. floresiensis was also a member that had become stranded on an island. But Stringer doesn't agree. In his commentary piece he notes the chin and jaw are more reminiscent of pre-human fossils, dating back approximately two million years.

Also, the body shape and tiny brain appear to be more primitive than humans. He says taken together, the evidence suggests a closer match with Australopithecus, a pre-human group living in Africa which also includes the remains of the famous "Lucy" - and which also date back to approximately 1.2 million years ago.
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