Yellow-headed spruce sawfly (Pikonema alaskense) collected in Gros Morne National Park, Newfoundland and Labrador, Canada, and photographed at the Centre for Biodiversity Genomics (sample ID: BIOUG14321-F12; specimen record: http://www.boldsystems.org/index.php/Public_RecordView?processid=SSGBA3378-14; BIN: http://www.boldsystems.org/index.php/Public_BarcodeCluster?clusteruri=BOLD:ABZ5094)
Chris McKay, an astrobiologist with NASA says: "I've been interested in the search for life in the Solar System for decades and I'm still flabbergasted by what we're seeing on Enceladus. It's such a small world so far from Earth, putting out such a wealth of organics and water and indications of habitability - it's astounding, and the samples are right there, free for the taking."
With enormous jets of icy particles and water vapor shooting tens of thousands of kilometers into space, and an vast, global ocean covered by an ice shell, Saturn's moon Enceladus is one of the most fascinating objects in our Solar System. NASA's Carolyn Porco, director of flight operations and imaging team leader for the Cassini spacecraft in orbit around Saturn, has described findings of the jets and elevated temperatures at the moon's South Pole as “the mother lode of all discoveries." The findings, noted Porco, point to the possibility of “an environment where life itself might be stirring.”
Complex organic molecules, whose precise composition remains unknown, have been detected in Enceladus's jets, creating conditions appear to be favorable to the emergence of life. The relative thinness of the ice shell at the south pole could also allow a future space exploration mission to gather data, in particular using radar, which would be far more reliable and easy to obtain than with the 40 kilometers thick ice shell initially calculated. It looks as if Enceladus still has many secrets in store!
“Should we ever discover that a second genesis had occurred in our solar system, independently outside the Earth,” Porco added, “then I think at that point the spell is broken. The existence theorem has been proven, and we could safely infer from it that life was not a bug but a feature of the universe in which we live, that it's commonplace and has occurred a staggering number of times.”
An international team including researchers recently proposed a new model that reconciles different data sets and shows that the ice shell at Enceladus's south pole may be only a few kilometers thick. This suggests that there is a strong heat source in the interior of Enceladus, an additional factor supporting the possible emergence of life in its ocean.
Initial interpretations of data from Cassini flybys of Enceladus estimated that the thickness of its ice shell ranged from 30 to 40 km at the south pole to 60 km at the equator. These models were unable to settle the question of whether or not its ocean extended beneath the entire ice shell.
However, the discovery in 2015 of an oscillation in Enceladus's rotation known as a libration, which is linked to tidal effects, suggests that it has a global ocean and a much thinner ice shell than predicted, with a mean thickness of around 20 km. Nonetheless, this thickness appeared to be inconsistent with other gravity and topography data.
The image below shows the thickness of Enceladus's ice shell, which reaches 35 kilometers in the cratered equatorial regions (shown in yellow) and less than 5 kilometers in the active south polar region (shown in blue).
In order to reconcile the different constraints, the researchers from the Laboratoire de Planétologie Géodynamique de Nantes (CNRS/Université de Nantes/Université d'Angers), Charles University in Prague, and the Royal Observatory of Belgium1 proposed a new model in which the top two hundred meters of the ice shell acts like an elastic shell.
According to this study, Enceladus is made up successively of a rocky core with a radius of 185 kilometers, and an internal ocean approximately 45 kilometers deep, isolated from the surface by an ice shell with a mean thickness of around 20 kilometers, except at the south pole where it is thought to be less than 5 kilometers thick. In this model, the ocean beneath the ice makes up 40% of the total volume of the moon, while its salt content is estimated to be similar to that of Earth's oceans.
Since a thinner ice shell retains less heat, the tidal effects caused by Saturn on the large fractures in the ice at the south pole are no longer enough to explain the strong heat flow affecting this region. The model therefore reinforces the idea that there is strong heat production in Enceladus's deep interior that may power the hydrothermal vents on the ocean floor.
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The Daily Galaxy via NASA, bbc.com and www2.cnrs.fr
Join Neil deGrasse Tyson and theoretical physicist and cosmologist Paul Steinhardt as they explore concepts like cosmic inflation, quantum tunneling, and whether gravity is extra-dimensional. Neil and Paul discuss whether the perception of time would be consistent across the multiverse, and whether reality and gravity are granular. Find out about the difference between the Big Bang and the Big Bounce.
Compare the concept of parallel universes with that of an ekpyrotic “meta-universe” that had no singularity at its birth, where space and time have existed forever, and where quantum fluctuations at the start of this cycle have given birth to causally separated regions that, though they can never know about each other due to distance and the limitations of the speed of light, are nonetheless connected by the fabric of spacetime.
LISTEN HERE -- Cosmic Queries: The Multiverse
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This image from ESA's Planck satellite appears to show something quite ethereal and fantastical: a sprite-like figure emerging from scorching flames and walking towards the left of the frame, its silhouette a blaze of warm-hued colours.
This fiery illusion is actually a celestial feature named the Polaris Flare. This name is somewhat misleading; despite its moniker, the Polaris Flare is not a flare but a 10 light-year-wide bundle of dusty filaments in the constellation of Ursa Minor (The Little Bear), some 500 light-years away.
The Polaris Flare is located near the North Celestial Pole, a perceived point in the sky aligned with Earth's spin axis. Extended into the skies of the northern and southern hemispheres, this imaginary line points to the two celestial poles. To find the North Celestial Pole, an observer need only locate the nearby Polaris (otherwise known as the North Star or Pole Star), the brightest star in the constellation of Ursa Minor.
Some of the secrets of the Polaris Flare were uncovered when it was observed by ESA's Herschel some years ago. Using a combination of such Herschel observations and a computer simulation, scientists think that the Polaris Flare filaments could have been formed as a result of slow shockwaves pushing their way through a dense interstellar cloud, an accumulation of cold cosmic dust and gas sitting between the stars of our Galaxy.
These shockwaves, reminiscent of the sonic booms formed by fast sound waves here on Earth, would have been themselves triggered by nearby exploding stars that disrupted their surroundings as they died, triggering cloud-wide waves of turbulence
These shockwaves, reminiscent of the sonic booms formed by fast sound waves here on Earth, were themselves triggered by nearby exploding stars that disrupted their surroundings as they died, triggering cloud-wide waves of turbulence. These waves swept up the gas and dust in their path, sculpting the material into the snaking filaments we see.
This image is not a true-colour view, nor is it an artistic impression of the Flare, rather it comprises observations from Planck, which operated between 2009 and 2013. Planck scanned and mapped the entire sky, including the plane of the Milky Way, looking for signs of ancient light (known as the cosmic microwave background) and cosmic dust emission. This dust emission allowed Planck to create this unique map of the sky a magnetic map.
The relief lines laced across this image show the average direction of our Galaxy's magnetic field in the region containing the Polaris Flare. This was created using the observed emission from cosmic dust, which was polarised (constrained to one direction). Dust grains in and around the Milky Way are affected by and interlaced with the Galaxy's magnetic field, causing them to align preferentially in space. This carries through to the dust's emission, which also displays a preferential orientation that Planck could detect.
The emission from dust is computed from a combination of Planck observations at 353, 545 and 857 GHz, whereas the direction of the magnetic field is based on Planck polarisation data at 353 GHz. This frame has an area of 30 x 30º on the sky, and the colours represent the intensity of dust emission.
Credit: ESA and the Planck Collaboration
“The loss of these magnificent animals would be a tremendous tragedy,” said Blaire Van Valkenburgh, a UCLA professor of ecology and evolutionary biology, and article co-author. “They are all that is left of a once much more diverse megafauna that populated the planet only 12,000 years ago. And more importantly, we have only just begun to understand the important roles they play in maintaining healthy ecosystems.”
Preventing the mass extinction of gorillas, rhinoceroses, elephants, lions, tigers, wolves, bears and the world's other largest mammals will require bold political action and financial commitments from nations worldwide. In an article in the journal BioScience, 43 wildlife experts write that without immediate changes, many of the Earth's most iconic species will be lost.
Among the most serious threats to endangered animals are illegal hunting, deforestation, habitat loss, expansion of livestock and agriculture into wildlife areas, and human population growth, they write.
The scientists, who represent six continents, write that humans have “an abiding moral obligation to protect the Earth's megafauna,” or large mammals. “We must not go quietly into this impoverished future.”
In addition to their significance to ecosystems, animals such as tigers and elephants attract tourists and their money to parts of the world that have few alternative sources of income, said Van Valkenburgh, who holds the Donald R. Dickey chair in vertebrate biology in the UCLA College. “This paper is a call for action at all levels, local to global, to halt the rapid decline of the megafauna,” she said.
The paper reports that 59 percent of the largest carnivores and 60 percent of the largest herbivores have been classified as threatened with extinction, and that the situation is especially severe in sub-Saharan Africa and Southeast Asia, where the greatest diversity of extant megafauna live.
William Ripple, the paper's lead author, a distinguished professor of ecology in the College of Forestry at Oregon State University, said the animals' declines are occurring rapidly.
“The more I look at the trends facing the world's largest terrestrial mammals, the more concerned I am we could lose these animals just as science is discovering how important they are to ecosystems and to the services they provide to people,” he said.
The scientists call for comprehensive action, including expanding habitats for the animals and changing conservation policy. The paper notes that some conservation initiatives have been successful and that, if measures are taken now, it may still be possible to rescue these animals from extinction.
The Daily Galaxy via UCLA
Image at top of page: With thanks to pickywallpapers.com
Some of the world's leading astronomers -- including Great Britain's former astronomer royal, the Cambridge physicist Lord Martin Rees -- believe aliens, rather than using different radio waves or visible light to signal, may be using an entirely different communication medium such as neutrinos or gravitational waves (ripples in the fabric of space-time) or using communication mechanisms we cannot even begin to fathom.
“The fact that we have not yet found the slightest evidence for life -- much less intelligence -- beyond this Earth," said Arthur C. Clarke, "does not surprise or disappoint me in the least. Our technology must still be laughably primitive, we may be like jungle savages listening for the throbbing of tom-toms while the ether around them carries more words per second than they could utter in a lifetime."
Lord Rees, a leading cosmologist and astrophysicist who is the president of Britain's Royal Society and astronomer to the Queen of England believes the existence of extraterrestrial life may be beyond human understanding.
“They could be staring us in the face and we just don't recognize them. The problem is that we're looking for something very much like us, assuming that they at least have something like the same mathematics and technology. I suspect there could be life and intelligence out there in forms we can't conceive. Just as a chimpanzee can't understand quantum theory, it could be there as aspects of reality that are beyond the capacity of our brains.”
"I think it very likely in fact, inevitable that biological intelligence is only a transitory phenomenon… If we ever encounter extraterrestrial intelligence, I believe it is very likely to be postbiological in nature, wrote Arizona State's Paul Davies in "The Eerie Silence". Davies suggests that advanced technology might not even be made of matter. That it might have no fixed size or shape; have no well-defined boundaries. Is dynamical on all scales of space and time. Or, conversely, does not appear to do anything at all that we can discern. Does not consist of discrete, separate things; but rather it is a system, or a subtle higher-level correlation of things.
"Are matter and information," Davies asks, all there is? Five hundred years ago, Davies writes, "the very concept of a device manipulating information, or software, would have been incomprehensible. Might there be a still higher level, as yet outside all human experience, that organizes electrons? If so, this "third level" would never be manifest through observations made at the informational level, still less at the matter level.
We should be open to the distinct possibility that advanced alien technology a billion years old may operate at the third, or perhaps even a fourth or fifth level -all of which are totally incomprehensible to the human mind at our current state of evolution in 2012.
Frank Drake, the founder of SETI and Drake's Equation, believes that satellite TV and the “digital revolution” is making humanity invisible to aliens by cutting the transmission of TV and radio signals into space. The earth is currently surrounded by a 50 light year-wide “shell” of radiation from analogue TV, radio and radar transmissions. According to Drake, digital TV signals would look like white noise to a race of observing aliens.
Although the signals have spread far enough to reach many nearby star systems, they are rapidly vanishing in the wake of digital technology, said Drake. In the 1960s, Drake spearheaded the conversion of the Arecibo Observatory to a radio astronomy center. As a researcher, Drake was involved in the early work on pulsars. Drake also designed the Pioneer plaque with Carl Sagan in 1972, the first physical message sent into space. The plaque was designed to be understandable by extraterrestrials should they encounter it.
Milan Cirkovic of the Astronomical Observatory in Belgrade, has pointed out that the median age of terrestrial planets in the Milky Way is about 1.8 gigayears (one billion years) greater than the age of the Earth and the Solar System, which means that the median age of technological civilizations should be greater than the age of human civilization by the same amount. The vastness of this interval indicates that one or more processes must suppress observability of extraterrestrial communities.
Since at this point, there is no direct and/or widely apparent evidence that extraterrestrial life exists, it likely means one of the following:
We are (A) the first intelligent beings ever to become capable of making our presence known, and leaving our planet. At this point, there are no other life forms out there as advanced as us. Or perhaps extraterrestrial life does exists, but for some reason extraterrestrial life is so very rare and so very far away we'll never make contact anyway -- making extraterrestrial life nonexistent in a practical sense at least.
Or is it (B) that many advanced civilizations have existed before us, but without exception, they have for some unknown reason, existed and/or expanded in such a way that they are completely undetectable by our instruments.
Or is it (C) There have been others, but they have all run into some sort of “cosmic roadblock” that eventually destroys them, or at least prevents their expansion beyond a small area.
Since Earth's placement in space and time appears to be unremarkably random, proposition “A” seems fairly unlikely. Assuming humans evolved like other forms of life into our present state due to natural selection, then there's really nothing all that mystical, special or remarkable about our development as a species either. Due to the sheer numbers, there are almost certainly other planets capable of supporting at least some form of life. If that is so, then for Earthlings to be the very first species ever to make a noticeable mark on the Universe, from a statistical perspective, is incredibly unlikely.
For proposition “B” to be correct would defy all logic. If potentially thousands, or even millions of advanced extraterrestrial civilizations exist in the known Universe, then why would all of them, without exception, choose to expand or exist in such a way that they are completely undetectable? It's conceivable that some might, or perhaps even the majority, but for all of them to be completely undetectable civilizations does not seem likely either.
Proposition C in some ways, appears to be more likely than A or B. If “survival of the fittest” follows similar pathways on other worlds, then our own “civilized” nature could be somewhat typical of extraterrestrial civilizations that have, or do, exist.
The idea communicating with aliens comes with concerns. British astrophysicist Stephen Hawking has warned that communicating with aliens could be a threat to Earth: "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans."
"The Three Body Problem" by science fiction Hugo Award winner, Liu Cixin, depicted the universe as a jungle with every civilization as a hidden hunter. Those who are exposed will be eliminated.
But Han Song, another leading Chinese science fiction writer, believes humans naturally want to connect, citing the Internet as proof. "I think aliens might think similarly. It is a biological instinct to connect with each other. Everyone wants to prove that they are not alone in the universe. Loneliness is intolerable to humans," he says.
Song also points out that the contact will be driven by curiosity and real requirements. "Humans will ultimately go to space to find resources and expand their living area, so it will be hard to avoid aliens. Contact with them, especially those with more advanced intelligence, may help us leap forward in civilization."
Regardless of the theoretical debate, scientists have never wavered in the search. "I think we shall call out. As a matter of fact, we have been yelling for years, and our radios and televisions are broadcasting in space all the time," says Mao Shude, director of the Center for Astrophysics of the Beijing-based Tsinghua University. "Aren't you curious what our counterparts would look like?
"If they are inferior or equal to us in terms of civilization, we won't be easily destroyed. If they are much more intelligent than us, they wouldn't be so narrow-minded as to compete with us. Some worry they will come to rob us of our natural resources, but they likely have the power to transform the entire globe already. What's the point of eliminating a much lower civilization?"
Mao believes the result will be significant however it turns out. "If we find other life, it will undoubtedly be the most important scientific discovery in our history; if not, it shows that life on Earth is unique and we should respect life and cherish each other."No matter the outcome, we shall never stop searching."
The image at the top of the page shows the Thirty Meter Telescope (TMT): a gigantic instrument with a mirror nearly three times as wide as any telescope in existence (another telescope, currently being built in Chile, will be larger). Once it's finished in 2024 atop Hawaii's Mauna Kea, astronomers plan to use the TMT to observe objects billions of light years away to better understand the processes that occurred just after the formation of the universe.
The Weekend Feature
The Daily Galaxy via The Telegraph, South China Morning Post, and xinhuanet.com
1964 Italian re-release 4-foglio for THE KILLING (Stanley Kubrick, USA, 1956)
Artist: Renato Casaro (b. 1935)
Poster source: Heritage Auctions
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White Tiger.
Taken at the Singapore Zoo
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Denis Papin Scientist of the Day
Denis Papin, a French inventor, was born Aug. 22, 1647.
In Louisiana, severe weather can often seem a trauma visited and revisited. But the disaster unfolding here this week fits into a recent and staggering pattern in more than half-dozen states, where floods have rolled out at such a scale that scientists say they might be a once-every-500-or-1,000-year occurrence. The cumulative, increasingly grim toll, from Maryland to South Carolina to Louisiana to Texas, includes scores of lives and billions of dollars in economic losses.
The size of wildfires has grown steadily for more than 30 years. In 1982, the average fire covered less than 25 acres. Today, the average wildfire burns about 100 acres...The federal government spent $202.8 million to fight fires in 1986. Last year, it spent $2.1 billion. One cause of the longer seasons is environmental: The warming climate has melted snowpacks earlier, increasing the length of time that forests dry out and become vulnerable to burning.
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That choice [Ken Salazar] means the oil and gas industry just hit a political gusher.
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The Best Tofu Scramble You've Ever Had
Reprinted from Living the Farm Sanctuary Life by Gene Baur and Gene Stone, copyright 2015 by Farm Sanctuary. By permission of Rodale Books.
Baur's sole culinary contribution to his new book and a family favorite, an awesome, animal-free version of the "wonderful Sunday morning family breakfasts of bacon and eggs when I was growing up."
1 medium red onion, chopped
1 red, orange, or yellow bell pepper, chopped
3 cloves garlic, finely chopped
8 ounces sliced white mushrooms
1 pound firm tofu, rinsed, drained, and crumbled
1 cup nutritional yeast
1-1/2 teaspoons salt
1 teaspoon ground black pepper
1 teaspoon ground turmeric
5 cups fresh spinach
In a cast-iron skillet over medium-high heat, add about 2 tablespoons water and cook the onion, bell pepper, and garlic. Stir frequently and add a 1/8" layer of water (it will steam off) to prevent the veggies from sticking. When the onion is translucent, add the mushrooms. Continue stirring and adding water as necessary.
When the mushrooms boil down to approximately half their original size, reduce the heat to medium and add the tofu, nutritional yeast, salt, and pepper. Continue stirring frequently, mixing and adding water as necessary. When the tofu, spices, and veggies are mixed well and heated evenly, after about 5 minutes, add the turmeric and continue stirring and adding water to prevent sticking.
After the tofu attains a uniform yellowish color, mix in the spinach, which will boil down to a fraction of its original size. Then enjoy!
Serves 4.
Variations: Feel free to add other veggies or more of the veggies listed above, which will make the dish less protein dense. You can also add vegan sausage, like Tofurky or Field Roast, if you want a heavier dish.
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