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Astronomers find more than 100,000 "stellar nurseries"
Every star we can see, including our sun, was born in one of these violent clouds.
This article was originally published on our sister site, Freethink.
An international team of astronomers has conducted the biggest survey of stellar nurseries to date, charting more than 100,000 star-birthing regions across our corner of the universe.
Stellar nurseries: Outer space is filled with clouds of dust and gas called nebulae. In some of these nebulae, gravity will pull the dust and gas into clumps that eventually get so big, they collapse on themselves — and a star is born.
These star-birthing nebulae are known as stellar nurseries.
The challenge: Stars are a key part of the universe — they lead to the formation of planets and produce the elements needed to create life as we know it. A better understanding of stars, then, means a better understanding of the universe — but there's still a lot we don't know about star formation.
This is partly because it's hard to see what's going on in stellar nurseries — the clouds of dust obscure optical telescopes' view — and also because there are just so many of them that it's hard to know what the average nursery is like.
The survey: The astronomers conducted their survey of stellar nurseries using the massive ALMA telescope array in Chile. Because ALMA is a radio telescope, it captures the radio waves emanating from celestial objects, rather than the light.
"The new thing ... is that we can use ALMA to take pictures of many galaxies, and these pictures are as sharp and detailed as those taken by optical telescopes," Jiayi Sun, an Ohio State University (OSU) researcher, said in a press release.
"This just hasn't been possible before."
Over the course of the five-year survey, the group was able to chart more than 100,000 stellar nurseries across more than 90 nearby galaxies, expanding the amount of available data on the celestial objects tenfold, according to OSU researcher Adam Leroy.
New insights: The survey is already yielding new insights into stellar nurseries, including the fact that they appear to be more diverse than previously thought.
"For a long time, conventional wisdom among astronomers was that all stellar nurseries looked more or less the same," Sun said. "But with this survey we can see that this is really not the case."
"While there are some similarities, the nature and appearance of these nurseries change within and among galaxies," he continued, "just like cities or trees may vary in important ways as you go from place to place across the world."
Astronomers have also learned from the survey that stellar nurseries aren't particularly efficient at producing stars and tend to live for only 10 to 30 million years, which isn't very long on a universal scale.
Looking ahead: Data from the survey is now publicly available, so expect to see other researchers using it to make their own observations about stellar nurseries in the future.
"We have an incredible dataset here that will continue to be useful," Leroy said. "This is really a new view of galaxies and we expect to be learning from it for years to come."
A man's skeleton, found facedown with his hands bound, was unearthed near an ancient ceremonial circle during a high speed rail excavation project.
- A skeleton representing a man who was tossed face down into a ditch nearly 2,500 years ago with his hands bound in front of his hips was dug up during an excavation outside of London.
- The discovery was made during a high speed rail project that has been a bonanza for archaeology, as the area is home to more than 60 ancient sites along the planned route.
- An ornate grave of a high status individual from the Roman period and an ancient ceremonial circle were also discovered during the excavations.
An ancient skeleton of a man dating back to the Iron Age was uncovered outside of London last month, and though archaeologists aren't certain what the cause of death was, clues point to a murder most foul.
A skeleton representing a man who was tossed face down into a ditch nearly 2,500 years ago with his hands bound in front of his hips was dug up during a high speed rail excavation.
The positioning of the remains have led archaeologists to suspect that the man may have been a victim of an ancient murder or execution. Though any bindings have since decomposed, his hands were positioned together and pinned under his pelvis. There was also no sign of a grave or coffin.
"He seems to have had his hands tied, and he was face-down in the bottom of the ditch," said archaeologist Rachel Wood, who led the excavation. "There are not many ways that you end up that way."
Currently, archaeologists are examining the skeleton to uncover more information about the circumstances of the man's death. Fragments of pottery found in the ditch may offer some clues as to exactly when the man died.
"If he was struck across the head with a heavy object, you could find a mark of that on the back of the skull," Wood said to Live Science. "If he was stabbed, you could find blade marks on the ribs. So we're hoping to find something like that, to tell us how he died."
Other discoveries at Wellwick Farm
The grim discovery was made at Wellwick Farm near Wendover. That is about 15 miles north-west of the outskirts of London, where a tunnel is going to be built as part of a HS2 high-speed rail project due to open between London and several northern cities sometime after 2028. The infrastructure project has been something of a bonanza for archaeology as the area is home to more than 60 ancient sites along the planned route that are now being excavated before construction begins.
The farm sits less than a mile away from the ancient highway Icknield Way that runs along the tops of the Chiltern Hills. The route (now mostly trails) has been used since prehistoric times. Evidence at Wellwick Farm indicates that from the Neolithic to the Medieval eras, humans have occupied the region for more than 4,000 years, making it a rich area for archaeological finds.
Wood and her colleagues found some evidence of an ancient village occupied from the late Bronze Age (more than 3,000 years ago) until the Roman Empire's invasion of southern England about 2,000 years ago. At the site were the remains of animal pens, pits for disposing food, and a roundhouse — a standard British dwelling during the Bronze Age constructed with a circular plan made of stone or wood topped with a conical thatched roof.
Ceremonial burial site
A high status burial in a lead-lined coffin dating back to Roman times.
Photo Credit: HS2
While these ancient people moved away from Wellwick Farm before the Romans invaded, a large portion of the area was still used for ritual burials for high-status members of society, Wood told Live Science. The ceremonial burial site included a circular ditch (about 60 feet across) at the center, and was a bit of a distance away from the ditch where the (suspected) murder victim was uncovered. Additionally, archaeologists found an ornately detailed grave near the sacred burial site that dates back to the Roman period, hundreds of years later when the original Bronze Age burial site would have been overgrown.
The newer grave from the Roman period encapsulated an adult skeleton contained in a lead-lined coffin. It's likely that the outer coffin had been made of wood that rotted away. Since it was clearly an ornate burial, the occupant of the grave was probably a person of high status who could afford such a lavish burial. However, according to Wood, no treasures or tokens had been discovered.
Sacred timber circle
An aerial view of the sacred circular monument.
Photo Credit: HS2
One of the most compelling archaeological discoveries at Wellwick Farm are the indications of a huge ceremonial circle once circumscribed by timber posts lying south of the Bronze Age burial site. Though the wooden posts have rotted away, signs of the post holes remain. It's thought to date from the Neolithic period to 5,000 years ago, according to Wood.
This circle would have had a diameter stretching 210 feet across and consisted of two rings of hundreds of posts. There would have been an entry gap to the south-west. Five posts in the very center of the circle aligned with that same gap, which, according to Wood, appeared to have been in the direction of the rising sun on the day of the midwinter solstice.
Similar Neolithic timber circles have been discovered around Great Britain, such as one near Stonehenge that is considered to date back to around the same time.
While we can see many solar storms coming, some are "stealthy." A new study shows how to detect them.
- "Stealth" solar storms are difficult to detect before they are near Earth.
- The use of various imaging techniques from multiple angles allowed researchers to detect these stealth storms earlier than ever.
- Not seeing one coming could have disastrous effects on our electronic infrastructure.
Solar storms are a collection of disturbances on the sun that influence space weather. They include things like solar flares and coronal mass ejections (CMEs), a large release of plasma in the solar wind. They can affect Earth in a number of ways, such as by increasing the number of particles that hit the Earth's magnetic field causing an aurora or — in severe cases — by disrupting technology and radio transmissions.
Most of the time, scientists can see storms as they occur on the sun. Information about the impact on Earth can be gathered a few days before it is likely to reach us. However, in as many as 20 percent of CMEs, there is little to no noticeable activity on the sun to give us an early warning. These "stealth" CMEs can have a huge impact on space weather but have proven difficult to spot until they have nearly arrived.
Luckily, a new study published in Frontiers in Astronomy and Space Sciences reports on new ways to detect so-called stealth solar storms long before they hit Earth.
The benefits of looking at the Sun
Unlike regular CMEs, stealth CMEs do not tend to give typical warning signs like clear dimming or brightening of the surface of the sun. Instead, they seem to form in a higher region of the sun's atmosphere called the corona than is typical. Unfortunately, watching for changes in the corona does not always give scientists the information they need to predict where a mass of plasma is moving.
In this study, the researchers took advantage of knowing the approximate origins of four stealth CMEs that were determined by data collected from Earth and the STEREO satellite, which was at a different angle with respect to the sun. The four CMEs differed in angle and intensity and occurred at different points in the solar cycle.
By using different imaging processes, subtle shifts in the upper corona were identified in each of the four cases examined. Most of the events also originated near areas with particularly strong magnetic fields.
The authors suggest that the small brightening and dimming effects they observed could be used to detect these CMEs in the future using similar methods. While they admit that the study does not provide a way to detect these CMEs before they form, they conclude that "identifying the source region of a stealth CME represents a first step toward providing more reliable predictions."
A bad day for Earth
Solar storms are not merely of academic interest. Large storms have occurred before, and the damage they can cause is potentially devastating. A strong solar storm in 1989 caused blackouts in Quebec and disrupted broadcasts of Radio Free Europe. That storm has nothing on the "Carrington Event" of 1859, however.
That solar storm was incredibly powerful, producing auroras visible in places like Queensland, Australia and the Caribbean. The auroras over New England were so bright that the residents could read newspapers by their light. Telegraph systems fried as a result of the huge amount of electromagnetic energy added to the Earth's magnetosphere, occasionally starting fires as they spontaneously sparked. Some telegraph operators reported being able to operate their machines without connecting them to wires.
A storm estimated to be just as powerful as the Carrington Event occurred in 2012, but the plasma it ejected narrowly missed Earth. According to a study by the National Academy of Sciences, the total cost of such an event to the United States today could be more than two trillion dollars. It would also cause damage that could take years to fully repair. It goes without saying that having large portions of our electric systems and technology fried with little time to prepare might also make things unpleasant for a lot of people.
Smaller storms hit Earth once every three years, often causing damage to systems that use electricity. Larger events are rarer, but not as rare as we would hope. A study from a few years ago calculated that the odds of a Carrington level event occurring is 12 percent per decade.
May the odds be in our favor
With odds and consequences like that, the ability to see a "stealth" solar storm coming might prove to be one of the most important tools humanity ever discovered.
Given enough warning, precautions can be taken to help minimize the damage to electronics from a large solar storm. For example, satellites can be moved out of harm's way, power grids can be primed to avoid being overloaded, and transformers can be taken offline to keep them from being destroyed.
If we fail to see the next Carrington Event coming, it might be a while before you can read the article we'll write about it.
Fear that new technologies are addictive isn't a modern phenomenon.
This article was originally published on our sister site, Freethink, which has partnered with the Build for Tomorrow podcast to go inside new episodes each month. Subscribe here to learn more about the crazy, curious things from history that shaped us, and how we can shape the future.
In many ways, technology has made our lives better. Through smartphones, apps, and social media platforms we can now work more efficiently and connect in ways that would have been unimaginable just decades ago.
But as we've grown to rely on technology for a lot of our professional and personal needs, most of us are asking tough questions about the role technology plays in our own lives. Are we becoming too dependent on technology to the point that it's actually harming us?
In the latest episode of Build for Tomorrow, host and Entrepreneur Editor-in-Chief Jason Feifer takes on the thorny question: is technology addictive?
Popularizing medical language
What makes something addictive rather than just engaging? It's a meaningful distinction because if technology is addictive, the next question could be: are the creators of popular digital technologies, like smartphones and social media apps, intentionally creating things that are addictive? If so, should they be held responsible?
To answer those questions, we've first got to agree on a definition of "addiction." As it turns out, that's not quite as easy as it sounds.
If we don't have a good definition of what we're talking about, then we can't properly help people.
LIAM SATCHELL UNIVERSITY OF WINCHESTER
"Over the past few decades, a lot of effort has gone into destigmatizing conversations about mental health, which of course is a very good thing," Feifer explains. It also means that medical language has entered into our vernacular —we're now more comfortable using clinical words outside of a specific diagnosis.
"We've all got that one friend who says, 'Oh, I'm a little bit OCD' or that friend who says, 'Oh, this is my big PTSD moment,'" Liam Satchell, a lecturer in psychology at the University of Winchester and guest on the podcast, says. He's concerned about how the word "addiction" gets tossed around by people with no background in mental health. An increased concern surrounding "tech addiction" isn't actually being driven by concern among psychiatric professionals, he says.
"These sorts of concerns about things like internet use or social media use haven't come from the psychiatric community as much," Satchell says. "They've come from people who are interested in technology first."
The casual use of medical language can lead to confusion about what is actually a mental health concern. We need a reliable standard for recognizing, discussing, and ultimately treating psychological conditions.
"If we don't have a good definition of what we're talking about, then we can't properly help people," Satchell says. That's why, according to Satchell, the psychiatric definition of addiction being based around experiencing distress or significant family, social, or occupational disruption needs to be included in any definition of addiction we may use.
Too much reading causes... heat rashes?
But as Feifer points out in his podcast, both popularizing medical language and the fear that new technologies are addictive aren't totally modern phenomena.
Take, for instance, the concept of "reading mania."
In the 18th Century, an author named J. G. Heinzmann claimed that people who read too many novels could experience something called "reading mania." This condition, Heinzmann explained, could cause many symptoms, including: "weakening of the eyes, heat rashes, gout, arthritis, hemorrhoids, asthma, apoplexy, pulmonary disease, indigestion, blocking of the bowels, nervous disorder, migraines, epilepsy, hypochondria, and melancholy."
"That is all very specific! But really, even the term 'reading mania' is medical," Feifer says.
"Manic episodes are not a joke, folks. But this didn't stop people a century later from applying the same term to wristwatches."
Indeed, an 1889 piece in the Newcastle Weekly Courant declared: "The watch mania, as it is called, is certainly excessive; indeed it becomes rabid."
Similar concerns have echoed throughout history about the radio, telephone, TV, and video games.
"It may sound comical in our modern context, but back then, when those new technologies were the latest distraction, they were probably really engaging. People spent too much time doing them," Feifer says. "And what can we say about that now, having seen it play out over and over and over again? We can say it's common. It's a common behavior. Doesn't mean it's the healthiest one. It's just not a medical problem."
Few today would argue that novels are in-and-of-themselves addictive — regardless of how voraciously you may have consumed your last favorite novel. So, what happened? Were these things ever addictive — and if not, what was happening in these moments of concern?
People are complicated, our relationship with new technology is complicated, and addiction is complicated — and our efforts to simplify very complex things, and make generalizations across broad portions of the population, can lead to real harm.
JASON FEIFER HOST OF BUILD FOR TOMORROW
There's a risk of pathologizing normal behavior, says Joel Billieux, professor of clinical psychology and psychological assessment at the University of Lausanne in Switzerland, and guest on the podcast. He's on a mission to understand how we can suss out what is truly addictive behavior versus what is normal behavior that we're calling addictive.
For Billieux and other professionals, this isn't just a rhetorical game. He uses the example of gaming addiction, which has come under increased scrutiny over the past half-decade. The language used around the subject of gaming addiction will determine how behaviors of potential patients are analyzed — and ultimately what treatment is recommended.
"For a lot of people you can realize that the gaming is actually a coping (mechanism for) social anxiety or trauma or depression," says Billieux.
"Those cases, of course, you will not necessarily target gaming per se. You will target what caused depression. And then as a result, If you succeed, gaming will diminish."
In some instances, a person might legitimately be addicted to gaming or technology, and require the corresponding treatment — but that treatment might be the wrong answer for another person.
"None of this is to discount that for some people, technology is a factor in a mental health problem," says Feifer.
"I am also not discounting that individual people can use technology such as smartphones or social media to a degree where it has a genuine negative impact on their lives. But the point here to understand is that people are complicated, our relationship with new technology is complicated, and addiction is complicated — and our efforts to simplify very complex things, and make generalizations across broad portions of the population, can lead to real harm."
Behavioral addiction is a notoriously complex thing for professionals to diagnose — even more so since the latest edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), the book professionals use to classify mental disorders, introduced a new idea about addiction in 2013.
"The DSM-5 grouped substance addiction with gambling addiction — this is the first time that substance addiction was directly categorized with any kind of behavioral addiction," Feifer says.
"And then, the DSM-5 went a tiny bit further — and proposed that other potentially addictive behaviors require further study."
This might not sound like that big of a deal to laypeople, but its effect was massive in medicine.
"Researchers started launching studies — not to see if a behavior like social media use can be addictive, but rather, to start with the assumption that social media use is addictive, and then to see how many people have the addiction," says Feifer.
The assumption that a lot of us are addicted to technology may itself be harming us by undermining our autonomy and belief that we have agency to create change in our own lives. That's what Nir Eyal, author of the books Hooked and Indistractable, calls 'learned helplessness.'
"The price of living in a world with so many good things in it is that sometimes we have to learn these new skills, these new behaviors to moderate our use," Eyal says. "One surefire way to not do anything is to believe you are powerless. That's what learned helplessness is all about."
So if it's not an addiction that most of us are experiencing when we check our phones 90 times a day or are wondering about what our followers are saying on Twitter — then what is it?
"A choice, a willful choice, and perhaps some people would not agree or would criticize your choices. But I think we cannot consider that as something that is pathological in the clinical sense," says Billieux.
Of course, for some people technology can be addictive.
"If something is genuinely interfering with your social or occupational life, and you have no ability to control it, then please seek help," says Feifer.
But for the vast majority of people, thinking about our use of technology as a choice — albeit not always a healthy one — can be the first step to overcoming unwanted habits.
For more, be sure to check out the Build for Tomorrow episode here.