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Higgs Boson-Like Particle Discovery Claimed at LHC

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Cern's Large Hadron Collider Resarts with Sights Set on Dark Matter - Press Association/ Science/ TheGuardian.com

"Cern confirms successful restart of world’s largest and most powerful atom smasher following upgrade, raising hopes of a ‘new era for science’..."


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Switches in the control centre of the Large Hadron Collider. Photograph: DENIS BALIBOUSE/REUTERS


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Multiparton Interactions at the Large Hadron Collider - by Jon Butterworth/ Science/ Life & Physics/ TheGuardian.com

"Away from the high-profile Higgs hunting, a new paper sheds some light on the complex inner life of the proton, and how it affects results from CERN's LHC.

For most of the past two years, before it stopped last week for a while, the LHC was making protons collide head on with each other. The protons are made of quarks and gluons, and most of the physics results we publish discuss each proton-proton collision as though it were a collision between a pair of these constituents. The rest of the proton – all those other quarks and gluons – is essentially just a nuisance.

However, a recent paper does something different. It measures what seem to be multiple quark and gluon collisions in the same proton-proton collisions.

This phenomenon is known as "multi-parton interaction". A "parton" is a part of the proton, as the name suggests. The term was introduced by Richard Feynman in 1969 to describe small pointlike bits (ok, parts) of very fast moving protons. Gell-Mann and Zweig had already proposed that hadrons were made of objects which Gell-Mann called quarks; but whether these were just mathematical tools to describe the symmetries of hadrons, or whether they had any more substantial reality was not clear..."

mural-large.jpg



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Cern Restarts Large Hadron Collider With Mission to Make Scientific History - by Ian Sample, Science Editor/ Science/ TheGuardian.com

"Physicists hope particle accelerator will explain dark matter, gravity and antimatter as it completes its test run following an upgrade..."

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The Large Hadron Collider at Cern in 2013. Engineers have spent the past two years reinforcing its connections and building in safety devices to prevent a short circuit. Photograph: Adam Warzawa/EPA


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HVC: The Point at Poipu, 3 deeded weeks, 1 of which is in The Club.
Thanks so much for posting these articles. If our local paper had any news about the restart, I missed it. Anybody interested in the LHC should watch the excellent movie Particle Fever. Here's the trailer:

https://youtu.be/Rikc7foqvRI
 

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Large Hadron Collider Finds Long-Sought Signs of Rare Particle Decays - by Amina Khan/ Science/ Science Now/ Los Angeles Times/ latimes.com

Smashing protons together in search of strange particles, scientists at the Large Hadron Collider near Geneva say they’ve discovered signs of particle decays that have long been predicted, but have never before been seen.

The decay pattern of the two B mesons, described in the journal Nature, could help researchers test the limits of the standard model of particle physics and probe unexplained cosmic phenomena, including the existence of dark matter and the dearth of antimatter in the universe.

Three years after the dramatic discovery of the Higgs boson -- a find that earned the theorists who predicted its existence a Nobel Prize -- CERN’s Large Hadron Collider has been retrofitted and upgraded to search for particles at even higher energies than before.

“From the scientific standpoint, this is big, heady stuff. All the puzzles of physics could fall into place or they could just remain mysteries based on what we learn from these decays,” said study co-author Joel Butler, a member of the collider’s Compact Muon Solenoid (CMS) experiment and an experimental particle physicist at Fermilab in Illinois. “This is kind of a fantastic time in physics, where many mysteries might get resolved.”

That’s because, while the Higgs boson fits neatly into the standard model, scientists know that the model does not truly explain the reality around us. It cannot account for dark matter -- the invisible, untouchable stuff that can’t be directly detected but whose gravitational influence defines the structure of the cosmos. Nor does it describe dark energy, the strange repulsive force that is causing the universe to expand at a faster and faster rate. It certainly can’t explain what happened to all the antimatter in the universe. If antimatter was created in equal or near-equal amounts to matter, then all (or at least most) of the matter and antimatter should have annihilated each other by now. The stuff we’re made of should not have survived -- or at least, not in such high amounts..."

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Scientists at the Large Hadron Collider have discovered particle decay patterns that have long been predicted by the standard model of particle physics. (CERN)


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Resurrected Large Hadron Collider Smashes Protons, and Speed Records - by Mary Beth Griggs/ Science/ Popular Science/ popsci.com

"And this was only a test...

The Large Hadron Collider (LHC) has hosted a number of major scientific achievements, not the least of which was the thrilling discovery of the elusive Higgs boson particle.

Now, the massive particle accelerator has done it again, smashing protons together at record-breaking energies yesterday on its first test run since it was shut down for upgrades two years ago

Previously, the particle collider sent beams of protons smashing into each other at 7 or 8 tera-electron volts (TeV) but now, the researchers have adjusted the equipment so that it can smash particles together with energies of 13 TeV, a feat they accomplished last night. On a human scale, one TeV isn't a huge amount of energy. The LHC glossary explains that a flying mosquito has about one TeV of energy. (Until you swat it. Then, it's a dead mosquito. (It knows what it did.))..."

cms-collisions.jpg

Collision
CMS
Particles are detected by the CMS instrument on the LHC after protons collide at 13 TeV


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Meet the Pentaquark, Just Spotted at CERN's Large Hadron Collider - by Eryn Brown/ Science News/ Sci-Tech Today/ sci-tech-today.com


"For decades, physicists have looked for the pentaquark -- a type of subatomic particle long theorized to exist but never seen, despite numerous false alarms.

This week, scientists at the European Organization for Nuclear Research, or CERN, announced that they had finally found their elusive quarry..."

larger-15-CERN-LargeHadronCollider-Pentaquark1.jpg



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Some Top Measurements From CERN's Large Hadron Collider - by Jon Butterworth/ Science/ Life & Physics/ theguardian/ theguardian.com

"New and improved measurements of the heaviest quark. Also, in what sense do protons get bigger as they go faster, and how do we know?..."




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LHC Experiment Hints at Possibility of New Particle - by Jesse Emspak/ Tech/ Innovation/ NBC News/ nbcnews.com

"The biggest particle accelerator in the world might have found a hint of an entirely new fundamental particle — or it might be seeing ghosts.

But even if it turns out to be nothing, particle physicists have written a spate of studies to coincide with the new experimental results, proposing different ideas about what might have been found. Theories in the new research papers range from positing new flavors of the Higgs boson (the particle thought to explain how other particles get their mass) to proposing candidates for dark matter.

If a new particle or particles turn out to be real, or if dark matter is confirmed, it would mean the reigning model of particle physics, the Standard Model, needs to be extended and possibly replaced..."

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The ATLAS detector in the Large Hadron Collider picked up this jet of particles (yellow and green bars) when protons collided at energies of 13 TeV. CERN, ATLAS


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Potential New Particle Shows Up at the LHC, Thrilling and Confounding Physicists - by Clara Moskowitz/ Scientific American/ scientificamerican.com

More info on the Potential New Particle:


"A little wiggle on a graph, representing just a handful of particles, has set the world of physics abuzz. Scientists at the Large Hadron Collider (LHC) in Switzerland, the largest particle accelerator on Earth, reported yesterday that their machine might have produced a brand new particle not included in the established laws of particle physics known as the Standard Model. Their results, based on the data collected from April to November after the LHC began colliding protons at nearly twice the energy of its previous runs, are too inconclusive to be sure—many physicists warned that the wiggle could just as easily represent a statistical fluke. Nevertheless, the finding has already spawned at least 10 new papers in less than a day proposing a theoretical explanation for the particle, and has the halls and blackboards of physics departments around the world churning..."

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Explore the Large Hadron Collider in 360-Degree Video - by Carl Franzen/ Science/ Synchrotronicity/ Popular Science/ popsci.com

"At 17-miles across, the Large Hadron Collider (LHC) is not only the world's largest particle accelerator, but it is also a fantastic spot for a 360-degree video shoot. BBC News recently went inside the vast, tunneling underground complex, located near Geneva, Switzerland, and came back out with the panoramic video above. Unless you're a particle physicist or have 12 friends you can rustle up for a public tour, it's probably the closest you'll come to standing near a mini-Big Bang anytime soon..."


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CERN Seeks International Artists for Full-Time Residency - by Danny Lewis/ Smart News: Keeping You Current/ SmithsonianMag.com

"For any artist out there wanting to get up close and personal with the world's largest and most powerful particle collider, this might be your chance: the European Center for Nuclear Research (CERN) is seeking submissions for its COLLIDE International Award. The lucky winner will get the opportunity to work with a CERN scientist on a project designed to bring art and science together..."

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Large Hadron Collider, Geneva, Switzerland (James Brittain/Corbis)
By Danny Lewis
smithsonian.com
March 16, 2016



Read more: http://www.smithsonianmag.com/smart...time-residency-180958448/#oYbRw3kd4ewpDop6.99
Give the gift of Smithsonian magazine for only $12! http://bit.ly/1cGUiGv
Follow us: @SmithsonianMag on Twitter


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CERN Opens Access to 300TB of Large Hadron Collider Data - by Mariella Moon/ Latest in Science/ Engadget/ engadget.com

"CERN will keep you researchers, students and dataphiles busy this weekend. The institute has released 300 terabytes of Large Hadron Collider data collected by the Compact Muon Solenoid (CMS) detector back in 2011. You know how scientists use the collider to smash particles? Well, the CMS is one of the two components of the LHC with the capability to see the particles (like the Higgs boson) or phenomena produced by those high-energy collisions.

The CMS team released two types of datasets you can access on CERN's OpenData website: the primary datasets are in the same format used by its own researchers, while the derived datasets require less computing power and are meant for students. ..."

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CERN Releases 300TB of Large Hadron Collider Data Into Open Access - by Devin Coldewey/ Large Hadron Collider/ Tech Crunch (TC)/ techcrunch.com

"Cancel your plans for this weekend! CERN just dropped 300 terabytes of hot collider data on the world and you know you want to take a look.

Kati Lassila-Perini, a physicist who works on the Compact Muon Solenoid (!) detector, gave a refreshingly straightforward explanation for this huge release.

“Once we’ve exhausted our exploration of the data, we see no reason not to make them available publicly,” she said in a news release accompanying the data. “The benefits are numerous, from inspiring high school students to the training of the particle physicists of tomorrow. And personally, as CMS’s data preservation coordinator, this is a crucial part of ensuring the long-term availability of our research data.” ...."

lhc_data_at_your_fingertips.jpg



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China's Biggest Bang, A Supercollider Twice the Size of CERN's - by Casey Hall/ Forbes/ Asia/ forbes.com

"Chinese scientists are forging ahead with plans to build the world’s largest supercollider as part of a broader effort to brand the country as a leader in theoretical and practical science.

The enormous machine, which was first floated shortly after the Swiss-based Large Hadron Collider proved the existence of the Higgs boson particle in 2012, is currently in the planning stages, with construction expected to start in 2021, according to state media reports.

The project will reportedly require $6 billion in investment, a significant sum in an age where belt-tightening from developed nations the world over has resulted in a trend for less government-sponsored investment in scientific endeavors..."

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GENEVA, SWITZERLAND – APRIL 20: A detailed view of one of the machines in the Crystal Laboratory at The European Organization for Nuclear Research commonly know as CERN on April 20, 2016 in Geneva, Switzerland. (Photo by Dean Mouhtaropoulos/Getty Images)


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Large Hadron Collider's New 'Particle' Was Just a Fluke - by Jon Fingas/ Gadgetry/ Engadget/ engadget.com

"Sorry, folks: CERN didn't mean to get your hopes up. Researchers have determined that Large Hadron Collider data suggesting a possible new particle was really just a "statistical fluctuation." Additional data collected over the course of the past several months reduced the unusual diphoton "bump" to a significance of 2 sigma, or well below the 5 sigma needed for a discovery to be considered authentic. It's just unusual that scientists saw a blip like this at both the ATLAS and CMS experiments, ATLAS' Dave Charlton explains to Scientific American.

Not that CERN sees the LHC's post-reboot operations as a waste. Its teams have collected roughly five times more data in 2016 than they obtained last year, and have spotted the elusive Higgs boson with higher certainty than they had the first time around. Moreover, the LHC is exceeding its hoped-for specs. It's surpassing its intended luminosity (collisions per second), which should help it spot even the rarest physics events at extremely high energy levels. While it may take a long time for results to emerge, the collider could be well on its way to making new discoveries that hold up under scrutiny..."

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CERN Introduces Large Haldron Collider's Robotic Inspectors

https://www.engadget.com/2016/11/26/cern-large-hadrone-collider-tim-robot-inspector/

"Since the Large Hadron Collider (LHC) needs to be in tip-top shape to discover new particles, it has two inspectors making sure everything's in working order. The two of them are called TIM, short not for Timothy, but for Train Inspection Monorail. These mini autonomous monorails that keep an eye on the world's largest particle collider follow a pre-defined route and get around using tracks suspended from the ceiling. According to CERN's post introducing the machines, the tracks are remnants from the time the tunnel housed the Large Electron Positron instead of the LHC. The LEP's monorail was bigger, but not quite as high-tech: it was mainly used to transport materials and workers...."

q:100

Patrice Loiez/CERN

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New Results From CERN Could Fill One of the Biggest Gaps In the Standard Model of Physics
By BEC Crew/ Science Alert/ sciencealert.com

"Of the many unanswered questions that stand in the way of the Standard Model of physics being able to adequately explain the Universe and everything in it, the mystery of matter-antimatter asymmetry is one of the biggest.

The equal amounts of matter and antimatter produced by the Big Bang should have cancelled each other out, resulting in a Universe with barely any particles, and yet, here we are. Now, new results from a Large Hadron Collider detector at CERN could be our best chance at explaining the paradox of our own existence...."

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Proton-proton collision in the LHCb. Credit: CERN


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Large Hadron Collider Gets "Open Heart Surgery"
By Jason Daley/ Smart News:Keeping You Current/ SmithsonianMag.com

"The massive physics experiment in Switzerland is receiving an upgrade.

The Large Hadron Collider has been smashing atoms together for almost a decade now, and making some incredible discoveries in the process. Now, a major upgrade of one of its detectors combined with a recent boost in the collider's power promises to make the world's largest machine even better at unlocking the sub-atomic secrets of the universe.

Yesterday, according to Paul Rincon at the BBC, engineers at the collider swapped out a large component known as a “pixel tracker” in the Compact Muon Solenoid (CMS), one of the major experiments along the LHC’s oval. The complexity and delicate nature of this procedure makes it comparable to performing open-heart surgery on the massive scientific instrument, which straddles the border between Switzerland and France, Rincon reports.


The collider uses 1,200 magnets to guide two beams of particles moving at almost the speed of light around the 16-mile-long oval. Researchers then cross those beams, resulting in high-energy collisions that sometimes reveal new types of particles. Discoveries made at the LHC include the vaunted Higgs boson as well as other exotic particles including pentaquarks and antiquarks. Along the particle beam's route are four major detectors, including CMS, that pick up signals from different types of particles created by the collisions.


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The innards of the Large Hadron Collider's CMS module (Max Brice/CERN)


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Yearning for New Physics at CERN, in a Post-Higgs Way
By Dennis Overbye/ Science/ The New York Times/ nytimes.com

"Physicists monitoring the Large Hadron Collider are seeking
clues to a theory that will answer deeper questions about the
cosmos. But the silence from the frontier has been ominous.

MEYRIN, Switzerland — The world’s biggest and most expensive time machine is running again.

Underneath the fields and shopping centers on the French-Swiss border outside Geneva, in the Large Hadron Collider, the subatomic particles known as protons are zooming around a 17-mile electromagnetic racetrack and banging into one another at the speed of light, recreating conditions of the universe when it was only a trillionth of a second old.

Some 5,000 physicists are back at work here at CERN, the European Organization for Nuclear Research, watching their computers sift the debris from primordial collisions in search of new particles and forces of nature, and plan to keep at it for at least the next 20 years.

Science is knocking on heaven’s door, as the Harvard physicist Lisa Randall put it in the title of her recent book about particle physics.

But what if nobody answers? What if there is nothing new to discover? That prospect is now a cloud hanging over the physics community...."

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A “physicist” in the office of John Ellis at CERN. Susy stands for supersymmetry. Credit Leslye Davis/The New York Times


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HVC: The Point at Poipu, 3 deeded weeks, 1 of which is in The Club.
Why it takes lots of drinks to build a super collider
By Vicky Hallett, Washington Post

What does it take to build the world’s largest particle accelerator? A circular 17-mile tunnel buried 300 feet underground. And a heck of a lot of booze.

“There were all these bottles of champagne in the control room. I thought we were going to become alcoholics,” recalls engineer Katy Foraz, one of four experts interviewed by Wired’s Emma Grey Ellis for “The Large Hadron Collider: An Oral History.”

The piece, in the magazine’s July issue, explains why so much celebration accompanied the construction of the collider, built by the European Organization for Nuclear Research (CERN) with the help of thousands of scientists and engineers from around the world.

In 2008, just after the machine started up for the first time, there was a major problem.

No, it hadn’t opened up a black hole, as conspiracy theorists feared it might. But there was “one bad welding job out of 10,000,” explains Frédérick Bordry, director of accelerators at CERN, which is based on the French-Swiss border near Geneva.

“Because of a bad connection between two magnets, one ton of liquid helium, the coolant we use on the magnets, was released into the tunnel,” he says.

So after a year of very expensive repairs, the team got going on Round 2.

This time, they set more incremental goals, which gave them more reasons to party. “With each step, we increased the energy of the beam,” Foraz says. “And then each week we would try again, and we would reach a new record and have more drinks.”

The strategy worked: Since March 2010, the Large Hadron Collider has been smashing high-energy particle beams together as scientists study the physics of the universe.


Cheers to that.
 

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The Large Hadron Collider Just Detected a New Particle That's Heavier Than a Proton
By Mike McCrae/ Science Alert/ sciencealert.com

"It's a big one.

The Large Hadron Collider has once again done what it does best – smash bits of matter together and find new particles in the carnage.

This time physicists have come across a real charmer. It's four times heavier than a proton and could help challenge some ideas about how this kind of matter sticks together...."

New_baryon_1024.jpg

Daniel Dominguez/CERN


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The Race to Reveal Antimatter's Secrets
By Elizabeth Gibney/ Nature/ Physics/ Scientific American/ scientificamerican.com

"In the shadow of the Large Hadron Collider, six teams are competing to answer one of the universe’s deepest existential questions.

In a high-ceilinged hangar at CERN, six rival experiments are racing to understand the nature of one of the Universe's most elusive materials. They sit just meters apart. In places, they are literally on top of one another: the metallic beam of one criss-crosses another like a shopping-center escalator, its multi-ton concrete support hanging ominously overhead.

“We're constantly reminded of each other,” says physicist Michael Doser, who leads AEGIS, an experiment that is vying to be the first to discover how antimatter — matter's rare mirror image — responds to gravity...."

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CERN's new antiproton decelerator, ELENA, is set to start slowing the particles down for study this year. Credit: Dean Mouhtaropoulos Getty Images



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Ultimate Theory of Particle Physics Holds Where Physicists Hoped It Wouldn't
By Ryan F. Mandelbaum/ Gizmodo/ gizmodo.com

"The smallest pieces of the universe are governed by a beautiful and mind-blowing set of rules: the “Standard Model.” The Standard Model explains the behavior of all 17 discovered particles, and it continues to make predictions that have been proven accurate by the largest physics experiments in the world, including the Large Hadron Collider in Switzerland. But the model is incomplete.

The Standard Model explains why each kind of fundamental particle exists, as well as how they interact with one another. But it fails to explain why is there so much more matter than antimatter in our universe—one of the biggest mysteries facing physicists today. Experiments designed to answer that question in a roundabout way, like the Large Hadron Collider beauty (LHCb) experiment, have detected tantalizing hints of new particle behaviors that don’t seem to obey the Standard Model. But newer results are clouding the story.

“That’s very puzzling,” Patrick Koppenburg from the Dutch National Institute for Subatomic Physics told Gizmodo. “There are hints of new physics... but there is no indication that this would lead to a solution of the matter-antimatter symmetry of the universe.”

The LHCb, one of the experiments on the Large Hadron Collider, was somewhat overlooked during the dramatic hunt for the Higgs boson. But this year, it has pumped out some interesting new results, including one that suggests completely uncharacterized physical rules. It’s especially well-suited to study a physical effect called “CP violation.” But new research demonstrates its findings might not demonstrate CP violation, and we’re no closer to understanding where the universe’s antimatter has gone...."

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Image: CERN/LHCb


Richard
 

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How Much Mass Does the W Boson Have?
By Jon Butterworth/ Science/ Life & Physics/ The Guardian/ theguardian.com

"And why it matters.

Whenever I describe the fundamental forces to an audience that does not entirely consist of other particle physicists (happens more often that you might think), it is the weak force that causes trouble.

Electromagnetism holds atoms together (amongst other fun stuff), the strong force holds atomic nuclei together, and gravity holds the planet together. But what does the weak force do? I am usually reduced to hand-waving about neutrinos and the Sun, in a faintly unconvincing fashion.

In fact the weak force is vital, especially for the Sun.

The carriers of the weak force are the W and the Z bosons, and – crucially – the W boson has an electric charge. This means that protons can transform into neutrons by the emission of a positively-charged W boson; and that in turn means that hydrogen (nucleus = 1 proton) can fuse together to eventually form Helium (nucleus = 2 protons and 2 neutrons). Energy is released in the process, and that keeps the Sun burning...."

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Photograph: NASA/Getty Images


Richard
 
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