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Massive planet too big for its own sun pushes astronomers to rethink exoplanet formation

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Massive planet too big for its own sun pushes astronomers to rethink exoplanet formation

LHS 3154b, a newly discovered massive planet that should be too big to exist.
The Pennsylvania

Suvrath Mahadevan, Penn State; Guðmundur Kári Stefánsson, Princeton University, and Megan Delamer, Penn State

Imagine you're a farmer searching for eggs in the chicken coop – but instead of a chicken egg, you find an ostrich egg, much larger than anything a chicken could lay.

That's a little how our team of astronomers felt when we discovered a massive planet, more than 13 times heavier than Earth, around a cool, dim red star, nine times less massive than Earth's Sun, earlier this year.

The smaller star, called an M star, is not only smaller than the Sun in Earth's solar system, but it's 100 times less luminous. Such a star should not have the necessary amount of material in its planet-forming disk to birth such a massive planet.

The Habitable Zone Planet Finder

Over the past decade, our team designed and built a new instrument at Penn State capable of detecting the light from these dim, cool at wavelengths beyond the sensitivity of the human eye – in the near-infrared – where such cool stars emit most of their light.

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Attached to the 10-meter Hobby-Eberly Telescope in , our instrument, dubbed the Habitable Zone Planet Finder, can measure the subtle change in a star's velocity as a planet gravitationally tugs on it. This technique, called the Doppler radial velocity technique, is great for detecting exoplanets.

Exoplanet” is a combination of the words extrasolar and planet, so the term applies to any planet-sized body in orbit around a star that isn't Earth's Sun.

Thirty years ago, Doppler radial velocity observations enabled the discovery of 51 Pegasi b, the first known exoplanet orbiting a Sunlike star. In the ensuing decades, astronomers like us have improved this technique. These increasingly more precise measurements have an important goal: to enable the discovery of rocky planets in habitable zones, the regions around stars where liquid can be sustained on the planetary surface.

The Doppler technique doesn't yet have the capabilities to discover habitable zone planets the mass of the Earth around stars the size of the Sun. But the cool and dim M stars show a larger Doppler signature for the same Earth-size planet. The lower mass of the star to it getting tugged more by the orbiting planet. And the lower luminosity leads to a closer-in habitable zone and a shorter orbit, which also makes the planet easier to detect.

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Planets around these smaller stars were the planets our team designed the Habitable Zone Planet Finder to discover. Our new discovery, published in the journal Science, of a massive planet orbiting closely around the cool dim M star LHS 3154 – the ostrich egg in the chicken coop – came as a real surprise.

LHS 3154b: The planet that should not exist

Planets form in disks composed of gas and dust. These disks pull together dust grains that grow into pebbles and eventually combine to form a solid planetary core. Once the core is formed, the planet can gravitationally pull in the solid dust, as well as surrounding gas such as hydrogen and helium. But it needs a lot of mass and materials to do this successfully. This way to form planets is called core accretion.

A star as low mass as LHS 3154, nine times less massive than the Sun, should have a correspondingly low-mass planet forming disk.

An artist's rendering of LHS 3154b. Credit: Abby Minnich.

A typical disk around such a low-mass star should simply not have enough solid materials or mass to be able to make a core heavy enough to create such a planet. From computer simulations our team conducted, we concluded that such a planet needs a disk at least 10 times more massive than typically assumed from direct observations of planet-forming disks.

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A different planet formation theory, gravitational instability – where gas and dust in the disk undergo a direct collapse to form a planet – also struggles to explain the formation of such a planet without a very massive disk.

Planets around the most common stars

Cool, dim M stars are the most common stars in our galaxy. In DC comics lore, Superman's home world, planet Krypton, orbited an M dwarf star.

Astronomers know, from discoveries made with Habitable Zone Planet Finder and other instruments, that giant planets in close-in orbits around the most massive M stars are at least 10 times rarer than those around Sunlike stars. And we know of no such massive planets in close orbits around the least massive M stars – until the discovery of LHS 3154b.

Understanding how planets form around our coolest neighbors will us understand both how planets form in general and how rocky worlds around the most numerous types of stars form and evolve. This line of research could also help astronomers understand whether M stars are capable of supporting .The Conversation

Suvrath MahadevanPenn State; Guðmundur Kári Stefánsson, NASA Hubble Fellow, Department of Astrophysical Sciences, Princeton University, and Megan Delamer, Graduate Student, Department of Astronomy, Penn State

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This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Bacteria can develop resistance to drugs they haven’t encountered before − scientists figured this out decades ago in a classic experiment

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Bacteria can develop resistance to drugs they haven't encountered before − scientists figured this out decades ago in a classic experiment

Bacteria are evolutionarily primed to outpace drug developers.
National Institute of Allergy and Infectious Diseases, National Institutes of Health/Flickr, CC BY-NC

Qi Zheng, Texas A&M University

Do bacteria mutate randomly, or do they mutate for a purpose? Researchers have been puzzling over this conundrum for over a century.

In 1943, microbiologist Salvador Luria and physicist turned biologist Max Delbrück invented an experiment to argue that bacteria mutated aimlessly. Using their test, other scientists showed that bacteria could acquire resistance to antibiotics they hadn't encountered before.

The Luria–Delbrück experiment has had a significant effect on science. The findings helped Luria and Delbruck win the Nobel Prize in physiology or medicine in 1969, and learn this experiment in biology classrooms. I have been studying this experiment in my work as a biostatistician for over 20 years.


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Decades later, this experiment offers lessons still relevant today, because it implies that bacteria can develop resistance to antibiotics that haven't been developed yet.

Slot machines and a eureka moment

Imagine a test tube containing bacteria living in nutrient broth. The broth is cloudy due to the high concentration of bacteria within it. Adding a virus that infects bacteria, also known as a phage, into the tube kills most of the bacteria and makes the broth clear.

Illustration of bacteriophage structure.
Bacteriophages are viruses that specifically infect bacteria.
Kristina Dukart/iStock via Getty Images Plus

However, keeping the test tube under conditions favorable for bacterial growth will turn the broth cloudy again over time. This indicates that the bacteria developed resistance against the phages and were able to proliferate.

What role did the phages play in this change?

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Some scientists thought the phages incited the bacteria to mutate for survival. Others suggested that bacteria routinely mutate randomly, and the of phage-resistant variants was simply a lucky outcome. Luria and Delbrück had been working together for months to solve this conundrum, but none of their experiments had been successful.

On the night of Jan. 16, 1943, Luria got a hint about how to crack the mystery while watching a colleague hit the jackpot at a slot machine. The next morning, he hurried to his lab.

Luria's experiment consisted of a few tubes and dishes. Each tube contained nutrient broth that would the bacteria E. coli multiply, while each dish contained material coated with phages. A few bacteria were placed into each tube and given two opportunities to generate phage-resistant variants. They could either mutate in the tubes in the absence of phages, or they could mutate in the dishes in the presence of phages.

Illustration of six test tubes and and six petri dishes, a few of the dishes containing red dots
This diagram of the Luria-Delbrück experiment depicts colonies of phage-resistant variants of E. coli (red) developing in petri dishes.
Qi Zheng, CC BY-SA

The next day, Luria transferred the bacteria in each tube into a dish filled with phages. The day after that, he counted the number of resistant bacterial colonies in each dish.

If bacteria develop resistance against phages by interacting with them, none of the bacteria in the tubes should have mutations. On the other hand, only a few of the bacteria – say, 1 out of 10 million bacteria – should spawn resistant variants when they are transferred into a dish containing phages. Each phage-resistant variant would grow into a colony, but the remaining bacteria would die from infection.

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If bacteria develop resistance independently of interacting with phages, some of the bacteria in the tubes will have mutations. This is because each time a bacterium divides in a tube, it has a small probability of spawning a resistant variant. If the starting generation of bacteria is the first to mutate, at least half of the bacteria will be resistant in later generations. If a bacterium in the second generation is the first to mutate, at lest an eighth of the bacteria will be resistant in later generations.

Four tree diagrams of green and red circles, with subsequent branches from red dots turning red
Mutations that confer resistance against phages (red) early on will spawn a large number of phage-resistant variants, while mutations that occur later on will spawn only a few resistant variants.
Qi Zheng, CC BY-SA

Like small-prize cash-outs in slot machines, late-generation mutations occur more often but give fewer resistant variants. Like jackpots, early-generation mutations occur rarely but give large numbers of variants. Early-generation mutations are rare because early on there are only a small number of bacteria available to mutate.

For example, in a 20-generation experiment, a mutation occurring at the 10th generation of bacteria would give 1,024 phage-resistant variants. A mutation occurring at the 17th generation would give only four phage-resistant variants.

The number of resistant colonies in Luria's experiments showed a similar pattern to that of slot machine cash-outs. Most dishes contained no or small numbers of mutant colonies, but several contained a large number of mutant colonies that Luria considered jackpots. This meant that the bacteria developed resistant variants before they interacted with the phages in the dishes.

An experiment's legacy

Luria sent a note to Delbrück after his experiment was completed, asking him to check his work. The two scientists then worked together to write a classic paper describing the experimental protocol and a theoretical framework to measure bacterial mutation rates.

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Other scientists conducted similar experiments by replacing phages with penicillin and with tuberculosis drugs. Similarly, they found that bacteria did not need to encounter an antibiotic to acquire resistance to it.

Bacteria have relied on random mutations to cope with harsh, constantly changing environments for millions of years. Their incessant, random mutations will them to inevitably develop variants that are resistant to the antibiotics of the future.

Drug resistance is a reality of we will have to accept and continue to fight against.The Conversation

Qi Zheng, Professor of Biostatistics, Texas A&M University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Your heart changes in size and shape with exercise – this can lead to heart problems for some athletes and gym rats

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Your heart changes in size and shape with exercise – this can lead to heart problems for some athletes and gym rats

William Cornwell, University of Colorado Anschutz Medical Campus

Exercise has long been recognized by clinicians, scientists and public health officials as an important way to maintain health throughout a person's lifespan. It improves overall , helps build strong muscles and bones, reduces the risk of chronic disease, improves mood and slows physical decline.

Exercise can also significantly reduce the risk of developing conditions that negatively affect heart heath, such as high blood pressure, high cholesterol and obesity. But large amounts of exercise throughout life may also harm the heart, leading to the of a called athletic heart.

As the sports cardiology director at the University of Colorado Anschutz Medical Campus, I'm often asked how much and what kind of exercise is necessary to get the of exercise. Many people also wonder about the risks of exercise, and what happens if you exercise too much.

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The American Heart Association generally recommends 150 minutes of moderate-intensity exercise, such as brisk walking, or 75 minutes of vigorous-intensity exercise, such as running, each . It also recommends muscle strengthening exercises at least twice per week.

When people exceed these guidelines, the heart may remodel itself in response – that is, it begins to change its size and shape. As a result, heart function may also change. These changes in heart structure and function among people who engage in high levels of exercise are referred to as the athletic heart, or athlete's heart. Athletic heart doesn't necessarily cause problems, but in some people it can increase the risk of certain heart issues.

What is athletic heart?

To understand how exercise affects the heart, it's important to consider what kind of exercise you're participating in.

Exercise is generally divided into two broad categories: dynamic and static.

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Dynamic exercises, like running, cross-country skiing and soccer, require the heart to pump an increased amount of blood, compared to the amount delivered to the body at rest, in order to sustain the activity. For example, when running, the amount of blood the heart pumps to the body may increase by threefold to fivefold compared to at rest.

Static exercises, like weightlifting, gymnastics or rock climbing, require the body to use skeletal muscle in order to push or pull heavy amounts of weight. While the heart does pump more blood to skeletal muscles that are working during these activities, these kinds of exercises depend on a muscle's ability to move the weight. For example, in order to do curls with dumbbells, the biceps must be strong enough to lift the desired weight.

Close-up of lower half of the back of a person cycling, one hand outstretched towards the vegetation on the side of the road
Cycling involves both dynamic and static exercise.
Judit Murcia/Unsplash, CC BY-SA

Some exercises, like rowing or cycling, are both highly dynamic and highly static because they require the heart to pump large amounts of blood while simultaneously requiring a large amount of muscle strength to sustain effort.

It is important to distinguish between dynamic and static exercise because the heart adapts differently according to the type of exercise you engage in over time. Dynamic exercise increases the volume of blood pumping through the heart and can cause the heart to become enlarged, or dilated, over time. Static exercise increases the amount of pressure on the heart and can also cause it to become enlarged over time but with thickened walls.

Who develops athletic heart?

Exercise that exceeds guidelines, such as exercising more than an hour most days of the week, may to development of athletic heart. Athletic heart commonly occurs among endurance athletes, who regularly compete in activities like marathons or other long-duration events. Many exercise several hours per day and more than 12 to 15 hours per week.

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Among runners, for example, the heart remodels itself in response to having to pump a high volume of blood. As a result, the chambers of the heart enlarge to hold and pump more blood. Among weightlifters, the heart remodels itself by thickening in response to the increase in pressure applied on the heart.

Exercise is good for the body, and athletic heart results from a lifelong commitment to an activity that promotes good health. But there may be some issues that arise from an athletic heart.

First, athletes with markedly enlarged hearts may be at risk of developing atrial fibrillation, which is abnormal heart rhythms that typically occur among older adults or people with high blood pressure or heart failure. Abnormal heart rhythms are worrisome because they may lead to a stroke.

There are many potential reasons atrial fibrillation occurs in athletes. A dilated atrium – the top chamber in the heart – may become inflamed and develop scar tissue, increasing the risk of atrial fibrillation. Stress and environmental factors may also work together to increase the risk of arrhythmia.

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Clip of an ultrasound reading of an enlarged heart beating
This is an echocardiogram of a 30-year-old athlete with an enlarged heart.
Runandbike/Wikimedia Commons, CC BY-SA

Coronary artery calcification, or CAC, is another concern among elite athletes. Coronary artery calcification, which commonly occurs in older adults or those with risk factors for coronary artery disease, increases the risk of having a heart attack or stroke. In recent years, have been using imaging tests to monitor calcium buildup in the arteries of their to try to determine their risk of heart attack or stroke over time.

It is not entirely clear why elite athletes develop coronary artery calcification. Fortunately, it does not appear that athletes have an increased risk of heart attack, even among those with very high levels of CAC. For example, a large study of almost 22,000 participants found that even athletes who engaged in high amounts of exercise and had elevated levels of CAC did not have an increased risk of death from cardiovascular disease over a decade of follow-up.

Some athletes are appropriately concerned about having calcium buildup in their heart arteries and may wonder whether or not they should be taking medications like aspirin or statins. But risks vary from person to person, so anyone concerned about CAC should talk to their doctor

Putting exercise in its place

Though elite athletes may have an increased risk of developing athletic heart, exercise undoubtedly remains one of, if not the best, methods to maintain a healthy lifestyle.

For example, if someone does not exercise routinely, their heart will become stiff and not pump blood as well as it once did. Routine exercise – especially dynamic exercise like running – maintains a compliant heart and prevents stiffening. A compliant heart will expand a lot more as it fills with blood and, in turn, pump out more blood with each heartbeat. A stiff heart has difficulty filling up with blood and has difficulty pumping blood through the body.

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Two people running on a road lined with trees -- the younger person is trailing behind the older person who has leaped into the air with arms raised
Regular exercise can help keep your heart young.
Viacheslav Peretiatko/iStock via Getty Images Plus

Generally, routine exercise throughout adulthood encourages the heart to remain strong and flexible even in old age. Even if someone were only to begin regularly exercising in their 40s to 50s, it is possible to reverse some of the effects of sedentary aging.

For example, a 2018 study of 53 sedentary people mostly in their early 50s found that those who participated in a two-year exercise program using a combination of running, cycling and elliptical exercise had hearts that became more compliant compared to the hearts of those who did not exercise.

It is never too late to start exercising. Routinely exercise guidelines can help promote physical and mental health and help your heart stay young throughout your life.The Conversation

William Cornwell, Associate Professor of Cardiology, University of Colorado Anschutz Medical Campus

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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I’ve been studying astronaut psychology since Apollo − a long voyage to Mars in a confined space could raise stress levels and make the journey more challenging

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I've been studying astronaut psychology since Apollo − a long voyage to Mars in a confined space could raise stress levels and make the journey more challenging

Crew members in space will spend lots of time together during future missions to Mars.
NASA via AP

Nick Kanas, University of California, San Francisco

Within the next few decades, NASA aims to humans on the Moon, set up a lunar colony and use the lessons learned to send people to Mars as part of its Artemis program.

While researchers know that space travel can stress space crew members both physically and mentally and test their ability to work together in close quarters, missions to Mars will amplify these challenges. Mars is far away – millions of miles from Earth – and a mission to the red planet will take two to two and a half years, between travel time and the Mars surface exploration itself.

As a psychiatrist who has studied space crew member interactions in orbit, I'm interested in the stressors that will occur during a Mars mission and how to mitigate them for the benefit of future space travelers.

Delayed communications

Given the great distance to Mars, two-way communication between crew members and Earth will take about 25 minutes round trip. This delayed contact with home won't just crew member morale. It will likely mean space crews won't get as much real-time from Mission Control during onboard emergencies.

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Because these communications travel at the speed of light and can't go any faster, experts are coming up with ways to improve communication efficiency under time-delayed conditions. These solutions might include texting, periodically summarizing topics and encouraging participants to ask questions at the end of each message, which the responder can answer during the next message.

Autonomous conditions

Space crew members won't be able to communicate with Mission Control in real time to plan their schedules and activities, so they'll need to conduct their work more autonomously than astronauts working on orbit on the International Space Station.

Although studies during space simulations on Earth have suggested that crew members can still accomplish mission goals under highly autonomous conditions, researchers need to learn more about how these conditions affect crew member interactions and their relationship with Mission Control.

For example, Mission Control personnel usually advise crew members on how to deal with problems or emergencies in real time. That won't be an option during a Mars mission.

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To study this back on Earth, scientists could a series of simulations where crew members have varying degrees of contact with Mission Control. They could then see what happens to the interactions between crew members and their ability to get along and conduct their duties productively.

Simulations, like the Mars500 mission, could help researchers learn about the effects of isolation and autonomy astronauts will deal with during a Mars mission.

Crew member tension

Being confined with a small group of people for a long period of time can to tension and interpersonal strife.

In my research team's studies of on-orbit crews, we found that when experiencing interpersonal stress in space, crew members might displace this tension by blaming Mission Control for scheduling problems or not offering enough . This can lead to crew-ground misunderstandings and hurt feelings.

One way to deal with interpersonal tension on board would be to schedule time each for the crew members to discuss interpersonal conflicts during planned “bull sessions.” We have found that commanders who are supportive can improve crew cohesion. A supportive commander, or someone trained in anger management, could facilitate these sessions to help crew members understand their interpersonal conflicts before their feelings fester and harm the mission.

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Time away from home

Spending long periods of time away from home can weigh on crew members' morale in space. Astronauts miss their families and being concerned about the well-being of their family members back on Earth, especially when someone is sick or in a crisis.

Mission duration can also affect astronauts. A Mars mission will have three phases: the outbound trip, the stay on the Martian surface and the return home. Each of these phases may affect crew members differently. For example, the excitement of being on Mars might boost morale, while boredom during the return may sink it.

The disappearing-Earth phenomenon

For astronauts in orbit, seeing the Earth from space serves as a reminder that their home, family and friends aren't too far away. But for crew members traveling to Mars, watching as the Earth shrinks to an insignificant dot in the heavens could result in a profound sense of isolation and homesickness.

Earth, shown from space, against a dark background.
Seeing Earth disappear could make crew members feel isolated.
AP Photo

telescopes on board that will allow the crew members to see Earth as a beautiful ball in space, or giving them access to virtual reality images of trees, lakes and family members, could help mitigate any disappearing-Earth effects. But these countermeasures could just as easily lead to deeper depression as the crew members reflect on what they're missing.

Planning for a Mars mission

Researchers studied some of these issues during the Mars500 program, a collaboration between the Russian and other space agencies. During Mars500, six men were isolated for 520 days in a space simulator in Moscow. They underwent periods of delayed communication and autonomy, and they simulated a landing on Mars.

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Scientists learned a lot from that simulation. But many features of a real Mars mission, such as microgravity, and some dangers of space – meteoroid impacts, the disappearing-Earth phenomenon – aren't easy to simulate.

Planned missions under the Artemis program will allow researchers to learn more about the pressures astronauts will face during the journey to Mars.

For example, NASA is planning a space station called Gateway, which will orbit the Moon and serve as a relay station for lunar landings and a mission to Mars. Researchers could simulate the outbound and return phases of a Mars mission by sending astronauts to Gateway for six-month periods, where they could introduce Mars-like delayed communication, autonomy and views of a receding Earth.

NASA's planned Gateway space station will orbit the Moon.

Researchers could simulate a Mars exploration on the Moon by having astronauts conduct tasks similar to those anticipated for Mars. This way, crew members could better prepare for the psychological and interpersonal pressures that come with a real Mars mission. These simulations could improve the chances of a successful mission and contribute to astronaut well-being as they venture into space.The Conversation

Nick Kanas, Professor Emeritus of Psychiatry, University of California, San Francisco

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This article is republished from The Conversation under a Creative Commons license. Read the original article.

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