dissabte, 31 de març del 2018

New Exoplanet K2-229b Could Reveal Mercury's Origins

Scientists from England’s University of Warwick and France’s Aix-Marseille University have found a new exoplanet that’s denser than any other Earth-sized planet discovered to date, according to a paper published Monday in Nature Astronomy. That means it may be built more like Mercury than Earth—which could shed light on how Mercury and other unusually dense planets were formed.
The planet, K2-229b, has a mass that’s about 2.5 times that of Earth. This is the first time scientists have been able to measure the mass of this planet, Jessie Christiansen, an astrophysicist with the NASA Exoplanet Science Institute at Caltech who was not involved in the research, told Newsweek.
“The really exciting thing for K2-229b is it’s not what we expected,” she said. “When we saw this planet that was Earth-sized, we thought it would have an Earth-like composition. But it turns out that it’s more like Mercury.”
What that means is that the planet is made of a lot more metal than rocklike material—which makes it weird, relative to other rocky planets like Earth and Mars. Scientists think these planets might form in one of three ways. Perhaps things ran into them and chipped the rocky bits off. Maybe the cloud of material that the planet and the star around which it's orbiting had less of the raw material that makes a planet rocky to begin with. Or maybe the stuff that was supposed to become the rocky bits got blasted away by solar radiation as the planet was beginning to form. Which of these scenarios actually happened is still up for debate.
To find out the answer, we need data from exoplanets—they help show us what’s possible. “The thing about astronomy is that we can’t run experiments,” said Jonathan Fortney, director of the Other Worlds Laboratory at the University of California, Santa Cruz. (He also was not involved in the research.) “All we can do is look at what nature gives us.”
With K2-229b, we now know any scenario that won’t allow for a Mercury-like planet to be as large as Earth probably isn’t the right one. For now, all the theories are still in play, Christiansen said, noting, “I don’t think this knocks anything out of contention.”
Scientists found K2-229b when the Kepler space telescope was looking at the sky between July 2016 and September 2016. Learning more about this and other, undiscovered exoplanets will happen—but not with that telescope. The spacecraft is running out of fuel, NASA announced on March 14.
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“Our current estimates are that Kepler’s tank will run dry within several months—but we’ve been surprised by its performance before!” the agency said on its website. “So, while we anticipate flight operations ending soon, we are prepared to continue as long as the fuel allows.”

The Iraq War and the Inevitability of Ignorance


There’s a reason why exactly it is so hard to be president—in normal circumstances—and why most incumbents look decades older when they leave the job than when they began. It is that the only choices normal presidents get to make are the impossible ones—decisions that are not simply very close calls on the merits, but that are guaranteed to lead to tragedy and bitterness whichever way they go.
Take Barack Obama’s famed choice not to back up his “red line” promise in Syria, which was a focus of Jeffrey Goldberg’s “The Obama Doctrine” Atlantic cover story two years ago. The option Obama chose—not intervening in Syria—meant death and suffering for countless thousands of people. The option he rejected—intervening— would have meant death and suffering for some thousands of the same people or others. Agree or disagree on the outcome, any such decision is intellectually demanding and morally draining. Normal presidents have to make them, one after another, all day long. (Why don’t they get any easier choices? Because someone else has made those before they get to the president.) Obama’s decision to approve the raid on Osama bin Laden’s compound turned out to be a tactical and political success. When he made it, he had to weigh the possibility that it could end in world-publicized failure—like Jimmy Carter’s decision to attempt a rescue of American hostages in Iran, which ended in chaos, and which Carter later contended was what sealed his fate in his re-election run.
In this May 1, 2011, file photo, President Barack Obama reads his statement to photographers after making a televised statement on the death of Osama bin Laden from the East Room of the White House in Washington. More than half…
 A special category of impossible decision, which I was introduced to in the two years I worked for Jimmy Carter in the White House and have borne in mind ever since, turns on the inevitability of ignorance. To be clear, I don’t mean “stupidity.” People in the government and military are overall smarter than press portrayals might suggest. Instead I mean really registering the uncomfortable fact that you cannot know enough about the big choices you are going to make, before you have to make them. Sometimes that is because of deadline rush: The clock is ticking, and you have to act now. (To give a famous example: In 1980 U.S. radar erroneously indicated that the Soviets had launched a nuclear-missile attack, and Zbigniew Brzezinski, as Jimmy Carter’s national-security adviser, had to decide at 3 a.m. to whether to wake the president to consider retaliation. It was revealed as a false alarm before he could place the call.) Most of the time it is because the important variables are simply unknowable, and a president or other decision-maker has to go on judgment, experience, hunch.
OCT 25 1980 Brezezinski, Zbigniew-Ind Security advisor Brown Palace Hotel Zbigniew Brzezinski

This point sounds obvious, because we deal with its analogues in daily-life decisions big and small. No one who decides to get married can really know what his or her spouse will be like 20 years in the future, or whether the partners will grow closer together or further apart. Taking a job—or offering one—is based at least as much on hope as on firm knowledge. You make an investment, you buy a house, you plan a vacation knowing that you can’t possibly foresee all the pitfalls or opportunities.
But this truism of life becomes far more consequential in the literally life-or-death choices that presidents must make, as commander in chief and as head of U.S. diplomatic and strategic efforts. The question of deciding about the unknowable looms large in my mind, as I think back 15 years to the run-up to the Iraq war, and think ahead to future such choices future presidents will weigh.
* * *
There’s a long list of books I wish presidents would have read before coming to office—before, because normal ones barely have time to think once they get there. For instance, the late David Fromkin’s A Peace to End All Peace is for me a useful starting point for thinking about strains within modern Middle East. (The book argues, in essence, that the way the Ottoman Empire was carved up at the end of World War I essentially set the stage for conflict in the region ever since. In that way it is a strategic counterpart to John Maynard Keynes’s famous The Economic Consequences of the Peace, written just after the conclusion of the Versailles agreements, which argues that the brutal economic terms dictated to the defeated Germans practically guaranteed future trouble there.)
High up among the books on my “wish they’d read” list is Thinking in Time: The Uses of History for Decision Makers, by two Harvard professors (and mentors of mine), Ernest May and Richard Neustadt. In this book May and Neustadt reverse the chestnut attributed to an earlier Harvard professor, George Santayana, that “those who do not remember the past are condemned to repeat it.” Instead they caution against over-remembering, or imagining that a choice faced now can ever be exactly like one faced before.
JUL 14 1963 Wyoming officials greet vice president on Cheyenne Arrival Members of the party are (left to right) Cheyenne Mayor Bill Nations, Mrs. Gale McGee, Vice President Lyndon Johnson, Wyoming Sen. Gale McGee.
 The most famous and frightening example is Lyndon Johnson’s, involving Vietnam. He “learned” so thoroughly the error of Neville Chamberlain, and others who tried to appease (rather than confront) the Nazis, that he thought the only risk in Vietnam was in delaying before confronting communists there. Because of the disaster Johnson’s decisions caused—the disaster for Vietnam, for its neighbors, for tens of thousands of Americans, all as vividly depicted in last year’s Ken Burns / Lynn Novick documentary—most American politicians, regardless of party, “learned” to avoid entanglement in Asian-jungle guerrilla wars. Thus in the late 1970s, as the post-Vietnam war Khmer Rouge genocide slaughtered millions of people in Cambodia, the U.S. kept its distance. It had given up the international moral standing, and the internal political stomach, to undertake another war in the place where it had so recently met defeat.
President Richard Nixon at a press conference, Washington DC, September 5, 1973

From its Vietnam trauma, the United States also codified a crass political lesson that Richard Nixon had learned later in the war. Just before Nixon took office, American troop levels in Vietnam were steadily on the way up, as were weekly death tolls, and monthly draft calls. The death-and-draft combination was the trigger for domestic protests. Callously but accurately, Nixon believed that he could reduce the protests if he ended the draft calls. Thus began the shift to the volunteer army—and what I called, in an Atlantic cover story three years ago, the “Chickenhawk Nation” phenomenon, in which the country is always at war but the vast majority of Americans are spared direct cost or exposure. (From the invasion of Iraq 15 years ago until now, the Americans who served at any point in Iraq or Afghanistan comes to just 1 percent of the U.S. population.)
May and Neustadt had a modest, practical ambition for their advice to study history, but to study it cautiously. “Marginal improvement in performance is worth seeking,” they wrote. “Indeed, we doubt that there is any other kind. Decisions come one at a time, and we would be satisfied to see a slight upturn in the average. This might produce much more improvement [than big dramatic changes] measured by results.”

My expectation is more modest still: I fear and expect that the U.S. is fated to lurch from one over-“learning” to its opposite, and continue making a steadily shifting range of errors. The decision to invade Iraq was itself clearly one of those. The elder George Bush fought a quick and victorious war to drive Saddam Hussein out of Kuwait in 1991. But he stopped short of continuing the war into Iraq to remove Saddam Hussein from power, and his son learned from that “failure” that he had to finish the job of eliminating Saddam. Two of the writers who were most eloquent in making their case for the war—Christopher Hitchens, who then wrote for the Atlantic among other places, and Michael Kelly, who was then our editor-in-chief—based much of their case on the evils Saddam Hussein had gotten away with after the original Gulf War. (Hitchens died of cancer in 2011; Kelly was killed in Iraq, as an embedded reporter in the war’s early stage.) Then Barack Obama, who had become president in large part because he opposed the Iraq war (which gave him his opening against the vastly better known Hillary Clinton), learned from Iraq about the dangers of intervention in Syria. And on through whatever cycles the future holds.
* * *
Is there escape from the cycles? In a fundamental sense, no, of course not. But I’ll offer the “lesson” I learned—50 years ago, in a classroom with Professor May; 40 years ago, when I watched Jimmy Carter weigh his choices; 15 years ago, in warning about the risks of invading Iraq. It involves a cast of mind, and a type of imagination.

As the Bush administration moved onto a war footing soon after the 9/11 attacks, no one could know the future risks and opportunities. But, at the suggestion of my friend and then-editor Cullen Murphy, I began reporting on what the range of possibilities might be. Starting in the spring of 2002, when the Bush team was supposedly still months away from a decision about the war, it was clear to us that the choice had been made. I interviewed dozens of historians, military planners, specialists in post-war occupations, and people from the region to try to foresee the likely pitfalls.
The result, which was in our November, 2002 issue (and which we put online three months earlier, in hopes of affecting the debate) was called “The Fifty-First State?” Its central argument was: The “war” part of the undertaking would be the easy part, and deceptively so. The hard part would begin when the statues of Saddam Hussein were pulled down—and would last for months, and years, and decades, all of which should be taken into consideration in weighing the choice for war.
It conceivably might have gone better in Iraq, and very well could have, if not for a series of disastrously arrogant and incompetent mistakes by members of the Bush team. (I won’t go into details here: I laid them out in several articles, including this, this, and this, and eventually a book.) But the premise of most people I interviewed before the war, who mostly had either a military background or extensive experience in the Middle East, was that this would be very hard, and would hold a myriad of bad surprises, and was almost certain to go worse than its proponents were saying. Therefore, they said, the United States should do everything possible to avoid invading unless it had absolutely no choice. Wars should be only of necessity. This would be folly, they said, and a war of choice.
Iraq War Protest with pictures of 1500+ US Soldiers who died in Iraq war
The way I thought of the difference between those confidently urging on the war, and those carefully cautioning against it, was: cast of mind. The majority of people I spoke with expressed a bias was against military actions that could never be undone, and whose consequences could last for generations. I also thought of it as a capacity for tragic imagination, of envisioning what could go wrong as vividly as one might dream of what could go right. (“Mission Accomplished!”)
Any cast of mind has its biases and blind spots. But I’m impressed, in thinking about the history I have lived through and the histories I have read, by how frequently people with personal experience of war have been cautious about launching future wars. This does not make them pacifists: Harry Truman, infantry veteran of World War I, decided to drop the atomic bomb. But Ulysses Grant, Dwight Eisenhower, Colin Powell (in most of his career other than the Iraq-war salesmanship at the United Nations)—these were former commanding generals, cautious about committing troops to war. They had a tragic imagination of where that could lead and what it might mean.
What lesson do we end with? Inevitably any of them will mismatch. The reasons not to invade Iraq 15 years ago are different from the risks to consider in launching a strike on North Korea or on Iran, or provoking China in some dispute in the East China Sea.  The value of tragic imagination remains: for leaders considering war or peace, for the media in stoking or questioning pro-war fever, for the 99 percent of the public in considering the causes for which the military 1 percent will be asked to kill, and die.

divendres, 30 de març del 2018

How Do You Remove 200,000 Pounds of Trash from Everest? Recruit Yaks.

Workers loading garbage collected from the Everest region at the airport in Lukla, Nepal, from which it will be flown to Kathmandu for recycling. Porters and yaks ferry the trash on their backs from a string of villages…

LUKLA, Nepal — Last weekend, a group of Sherpas gathered outside Buddha Lodge in this speck of a town near Mount Everest, stuffing cloth sacks filled with thousands of pounds of garbage into a turboprop plane.
As the number of trekkers and mountaineers winding through the Everest region has multiplied, so too has the trash — empty bottles of Tuborg beer, food cans, torn tents, empty oxygen bottles. Now, organizers of a national cleanup campaign have set a target of collecting and recycling 200,000 pounds (about 100 ton) of trash in the area, making it one of Nepal’s most ambitious waste management projects to date.
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“Trash has become a major problem,” said Dalamu Sherpa, the chairwoman of a local women’s group, adding that the project was partly about “saving the glory of the Everest region.”
In this March 11, 2017 file photo, trekkers hike towards Everest Base camp near Lobuche, Nepal. Mountaineering expedition organizers in Nepal are sending huge trash bags with climbers on Mount Everest during the spring climbing…

Nepal has taken several steps to reduce garbage in the Khumbu region, which includes Mount Everest, the highest peak in the world. In 2014, the country’s tourism ministry declared that anyone climbing the mountain must return from the trip with an extra 18 pounds of garbage.
But rules are loosely enforced in the area, and the authorities have struggled to find a realistic solution to the problem. Every year, thousands of people snake along steep trails to reach South Base Camp, which sits more than 17,000 feet above sea level. The spring climbing season typically lasts from late April to the end of May.
Collecting the trash involves days of walking. Porters and yaks ferry garbage on their backs from a string of villages leading up to base camp, which takes about a week to reach by foot from Lukla.
Umesh Chandra Rai, the chief executive of Yeti Airlines, a local operator, said the plan was to transport 200,000 pounds of garbage to Kathmandu, Nepal’s capital, by the end of the year, where it will be recycled. So far, about 24,000 pounds of garbage has been collected. Along the trails, 16 waste dumping sites, 46 trash cans and three toilets have also been installed.
A general view of the Mount Everest range is seen from Tengboche some 300kms north-east of Kathmandu on May 5, 2017
 “Previously, trash dumping areas were made of plastic sheets, so yaks easily destroyed them,” said Nim Dorjee Sherpa, a municipal official. “We have now installed rubbish bins made of stone and zinc sheets.”
The challenge of hauling material away is so vast that even the bodies of climbers who died on the mountain are sometimes left in place.
“It is very difficult not because of logistical and technical reasons, but because of the law,” said Ang Dorjee Sherpa, the head of the Sagarmatha Pollution Control Committee, which maintains the mountain. “We can’t cremate or bury the dead bodies without consent.”
On a recent cloudless Saturday morning as the temperature hovered around freezing, a dozen volunteers assembled at Tenzing-Hillary Airport, a busy tarmac perched on a cliffside, where sacks of trash were piled high.
As the bags were loaded into the cargo hold of the turboprop, ruddy-faced locals said littering would no longer be tolerated.
“Tourists are not fully abiding by our rules,” said Biruman Rai, the principal of a government school in town. “It is time to enforce the law.”

dijous, 29 de març del 2018

NASA 'unable to stop' enormous asteroid Bennu which could hit Earth in 2135


NASA will be unable to stop an enormous asteroid which could crash into Earth in 2135, scientists have warned.
It is estimated that Bennu, which is the size of the Empire State Building, would unleash 1,200 megatons of energy on impact, 80,000 times the energy of the Hiroshima bomb.
Members of a US ‘national planetary defence team’ have published a study warning of the potentially “dire” consequences of the huge space rock smashing into the planet.
Scientists based at the Lawrence Livermore National Laboratory have been working with NASA on a spacecraft called HAMMER (Hypervelocity Asteroid Mitigation Mission for Emergency Response vehicle).

The 9 metre tall, 8.8 tonne craft is able to deflect asteroids away from Earth and destroy them with nuclear bombs.
In the case of Bennu, scientists have deemed HAMMER “inadequate” as it would be unable to nudge the massive asteroid off course.
The rock is 500 metres in diameter – as wide as five football fields – and weighs about 79 billion kilograms, making it 1,664 times as heavy as the Titanic.
Academics concluded that "using a single HAMMER spacecraft as a battering ram would prove inadequate for deflecting an object like Bennu."

his leaves only the dangerous nuclear option, which is not preferred as it could result in the Earth being showered with radioactive rock fragments.
Bennu has a 1 in 2,700 chance of striking Earth on September 25, 2135.
Kirsten Howley, who is a physicist at Lawrence Livermore National Laboratory and co-author on the paper, said: “The chance of an impact appears slim now, but the consequences would be dire.
“This study aims to help us shorten the response timeline when we do see a clear and present danger so we can have more options to deflect it. The ultimate goal is to be ready to protect life on Earth.”

The study said it would take a minimum of 7.4 years to reach Bennu if the decision was made to send a craft and "many years for the small change in speed to accumulate into a sufficient change in trajectory".
Ms Howley said: "The probability of a Bennu impact may be 1 in 2,700 today, but that will almost certainly change – for better or worse – as we gather more data about its orbit.
“Delay is the greatest enemy of any asteroid deflection mission. That’s why there’s urgency in getting viable deflection platforms on the shelf today.”

dimecres, 28 de març del 2018

The photos that Hitler banned

Knobbly-kneed photo that Hitler tried to ban is unearthed in photo album British soldier grabbed as a souvenir from prominent Nazi 73 years ago

The black and white snap depicts the dictator sat crossed legged on a chair wearing lederhosen and knee-high socks with his bare legs on display.

A photo of a knobbly-kneed Adolf Hitler that he later tried to ban has been unearthed in an album taken as a souvenir by a British soldier more than 70 years ago.
The black and white snap depicts the dictator sat crossed legged on a chair wearing lederhosen and knee-high socks with his bare legs on display.
Viktor Lutze junior

It was taken in the 1920s at a time when Hitler wanted to portray himself as a man of the people.
But after he came to power in 1933 he tried to suppress the embarrassing picture as it went against his image as a hardened, iron-fisted ruler.
Lutze's son, Viktor Jnr, served in the German army and the album contains a picture of him as a teenager with Hitler taken before the war

The photo album was found in the former home of prominent Nazi Viktor Lutze by a British army officer who was billeted there at the end of the Second World War.
Lutze's son, Viktor Jnr, served in the German army and the album contains a picture of him as a teenager with Hitler taken before the war.
Thousands attend a Nazi rally during which Adolf Hitler spoke to the masses as they paraded their National Socialist flags

Lutze, who was the leader of the notorious 'Brownshirts'- the paramilitary wing of the Nazi party - died in a car crash along with his daughter Inge in Potsdam, Germany, in 1943.
In the album there are numerous family photos of Lutze with his children and wife Paula.
A group of high ranking Nazi generals attending a rally in about 1925. The photo was one of several black and white snaps found in Lutze's former home

Other snaps show the henchman being treated as a VIP at Nazi rallies. One picture shows him quaffing a goldfish bowl-sized glass of red wine.
The photos have now come to light by the son of the army officer who spirited them out of Lutze's old house in Bevergern in western Germany in 1945.
In another photo from the album, Hitler once again meets with a young Viktor Lutze Jnr before his death in 1943

The unnamed officer of the Royal Engineers brought them back to Britain with him after the war and it has been kept in his family ever since.
The photos are being sold by Hansons Auctioneers of Etwell, Derbys.
Viktor Lutze's wife Paula and Viktor Lutze junior
Adrian Stevenson, of Hansons, said: 'The odd-looking picture of Hitler was taken long before he became the German Chancellor and Fuhrer.
'He is captured wearing an alpine jacket and lederhosen.
'It was an early propaganda image and Hitler looked like a peasant to try and create the image that he was one of the people.

A Nazi rally held before the start of the war. An unnamed officer of the Royal Engineers brought the photos back to Britain with him after the war and it has been…

'But when he came to power it was entirely the wrong image to portray and he didn't want that image being used. He thought that a photo of him with his knees on display would harm his image.
'He tried to suppress it and it was banned from use.
Viktor Lutze senior drinks before the war

'Probably a few hundred of them were printed. It is very rare to come across these pictures today.
'This one came from the house of the high-ranking Nazi Viktor Lutze who was the head of the brownshirts.
Viktor Lutze junior (R) with his mother Paula and sister Inge

Had he survived the war Lutze would have been tried at Nuremberg and probably would have hung for war crimes.
'In 1945 a British officer of the Royal Engineers was billeted in his old house and he liberated these photos, shall we say.
'They have just been sat in a drawer for years and his son has decided now is the right time to sell them.'
Viktor Lutze (shown far left) is seen leading a Nazi rally in the 1920s. The photos are being sold in four lots for about £50 each on March 19
Lutze died aged 52 and was given a state funeral in Germany, which Hitler spoke at.
The photos are being sold in four lots for about £50 each on March 19.

L'atac nord-americà de Doolittle contra el Japó va canviar el corrent de la Segona Guerra Mundial

Fa 80 anys: el Doolittle Raid va marcar el dia que sabíem que podríem guanyar la Segona Guerra Mundial. Com a patriòtic nord-americà, durant...