Rapid-fire fast radio burst shows hot space between galaxies

The Five-hundred-meter Aperture Spherical radio Telescope, known as FAST, in Ghizou province, southwest China, where Fast Radio Burst 20190520B was discovered, is considered the spiritual successor to the now-defunct, Cornell-built Arecibo Observatory in Puerto Rico.
Credit: Shami Chatterjee

A rare and persistent rapid-fire fast radio burst source – sending out an occasional and informative cosmic ping from more than 3.5 billion light years away – now helps to reveal the secrets of the broiling hot space between the galaxies.

What excites astronomers about the repeating fast radio bursts (FRBs) – since they only burst once, generally speaking – is that these quick-fire surges provide a pathway for scientists to comprehend the perplexing, mysterious and million-degree intergalactic medium.

This work, “A Repeating Fast Radio Burst Associated with a Persistent Radio Source,” was published June 8 in Nature, by an international group of scientists led by Chinese and Cornell astronomers.

“Examining the intergalactic medium is really hard,” said co-author Shami Chatterjee, Ph.D. ’03, principal research scientist in astronomy in the College of Arts and Sciences. “The intergalactic medium is difficult to probe, which is why fast radio bursts are exciting. The bursts let us study the properties of the intergalactic medium.”

Joining Chatterjee on the Nature paper are James M. Cordes, the George Feldstein Professor of Astronomy (A&S) and Stella K. Ocker, a doctoral student in astronomy.

Human skin can be damaged by exposure to thirdhand smoke and electronic cigarette spills

Prue Talbot (left) and her former graduate student Giovanna Pozuelos.
Credit: UCR/Stan Lim

A University of California, Riverside, study has found that dermal exposure to nicotine concentrations found in thirdhand smoke, or THS, and electronic cigarette spills may damage the skin.

THS, of which nicotine is a major component, is created when exhaled smoke and smoke emanating from the tip of burning cigarettes settles on surfaces such as clothing, hair, furniture, and cars. Not strictly smoke, THS refers to the residues left behind by smoking. Electronic cigarette spills are e-liquid spills that may occur by leaky electronic cigarette products or when consumers and vendors mix e-liquids for refillable electronic cigarettes.

Study results appear in Atmosphere, a journal.

“We found dermal contact with nicotine may impair wound healing, increase susceptibility to skin infections due to a decrease in immune response, and cause oxidative stress in skin cells,” said Giovanna Pozuelos, who graduated earlier this year from UC Riverside with a doctoral degree in cell, molecular, and developmental biology.

The study was performed using EpiDermTM, a 3D model of the human epidermis, and cultured human keratinocytes. Keratinocytes are epidermal cells that produce keratin, the protein found in hair and fingernails. The researchers exposed EpiDermTM for 24 hours to different nicotine concentrations typically found in THS environments and electronic cigarette spills. The researchers then proceeded to identify processes and pathways altered by the exposure. They investigated nicotine’s effect on cellular organelles, mitochondria, and peroxisomes — organelles containing enzymes involved in many metabolic reactions.

Zinc Found to Play an Important Role in Lung Fibrosis

Paul Noble, MD

Cedars-Sinai research shows targeting a newly identified molecular Pathway with a common mineral could help reverse lung damage in Idiopathic Pulmonary Fibrosis patients

Investigators from the Women’s Guild Lung Institute at Cedars-Sinai have discovered that zinc, a common mineral, may reverse lung damage and improve survival for patients with a deadly age-related condition known as idiopathic pulmonary fibrosis (IPF).

Their findings, published in The Journal of Clinical Investigation, have the potential to change the landscape of treatment for patients with this disease, which most often affects those over age 50.

“This study has the potential to be a game changer,” said Paul Noble, MD, chair of the Department of Medicine, director of the Women’s Guild Lung Institute and co-senior author of the study. “We identified a root cause of IPF-related lung damage and a potential therapeutic target that might restore the lungs’ ability to heal themselves.”

Idiopathic pulmonary fibrosis, or IPF, affects 100,000 people in the U.S. and has no known cause. The condition, which leads to scarring of the lungs, called fibrosis, and progressive breathing difficulty, has no cure, and most patients die or require a lung transplant within three to five years of diagnosis. The incidence of IPF rises dramatically with age and affects men more often than women.

Through this research, Cedars-Sinai investigators found that stem cells lining the air sacs in the lungs of patients with IPF lose their ability to process zinc, which is known to have a role in the growth of cells and healing damaged tissue.

Earth Is Safe: Astronomers Conducted a "Space Exercise"

Today, the distance from Apophis to Earth is 0.88 astronomical units, or almost 132 million km.
Photo: Eyes on Asteroids / NASA

More than 100 astronomers from 18 countries conducted a "space exercise". They joined their efforts to simulate the approach to the Earth of a dangerous asteroid and to estimate the probability of collision. Employees of the Kourovka Astronomical Observatory of the UrFU also took part in the project: Eduard Kuznetsov, Dmitry Glamazda, Galina Kaiser, Aleksandr Perminov and Yulia Vibe. The study was led by experts from NASA and the International Asteroid Warning Network (IAWN). The results are published in the Planetary Science Journal.

The asteroid Apophis, which was approaching Earth from December 2020 to March 2021, was taken as a sample of the potential threat. According to the "exercises", all data on Apophis were "forgotten", and scientists had to detect the asteroid again, determine its coordinates, speed, trajectory and many other parameters, as well as estimate the probability of collision with the Earth, the strength (energy) of the hit, which can cause an asteroid like Apophis. By common efforts it was even possible to determine the general composition of the asteroid and the properties of its surface. It was crucial, however, to understand how far in advance scientists were able to detect and how quickly they could classify extraterrestrial bodies that could pose a danger to the Earth.

International team visualizes properties of plant cell walls at nanoscale

Scattering-type scanning near-field optical microscopy, a nondestructive technique in which the tip of the probe of a microscope scatters pulses of light to generate a picture of a sample, allowed the team to obtain insights into the composition of plant cell walls.
Credit: Ali Passian/ORNL, U.S. Dept. of Energy

To optimize biomaterials for reliable, cost-effective paper production, building construction, and biofuel development, researchers often study the structure of plant cells using techniques such as freezing plant samples or placing them in a vacuum. These methods provide valuable data but often cause permanent damage to the samples.

A team of physicists including Ali Passian, a research scientist at the Department of Energy’s Oak Ridge National Laboratory, and researchers from the French National Centre for Scientific Research, or CNRS, used state-of-the-art microscopy and spectroscopy methods to provide nondestructive alternatives. Using a technique called scattering-type scanning near-field optical microscopy, the team examined the composition of cell walls from young poplar trees without damaging the samples.

But the team still had other obstacles to overcome. Although plant cell walls are notoriously difficult to navigate due to the presence of complex polymers such as microfibrils — thin threads of biomass that Passian describes as a maze of intertwined spaghetti strings — the team reached a resolution better than 20 nanometers, or about a thousand times smaller than a strand of human hair. This detailed view allowed the researchers to detect optical properties of plant cell materials for the first time across regions large and small, even down to the width of a single microfibril. Their results were published in Communications Materials.

Gravity-defying spike waves rewrite the rule book

The ‘spike wave’ created in the FloWave circular wave tank
Credit: University of Oxford

Researchers studying wave breaking have found that axisymmetric ‘spike waves' can far exceed limits that were previously thought to dictate the maximum height of ocean waves.

In a new study on ocean wave breaking, researchers have demonstrated that the breaking behavior of axisymmetric ‘spike waves’ is quite different to the long-established theories on the breaking of traveling waves.

Travelling waves break when waves become so steep that the crest is no longer stable. This leads to a breakdown of wave motion and energy loss. As a result, the height of the wave is limited by the breaking process.

‘Much of our understanding of wave breaking is routed in theories developed and experiments carried out in two dimensions when waves are moving in one direction,’ explained lead author Dr Mark McAllister, Department of Engineering Science, University of Oxford. ‘However, wave breaking in the ocean is a three-dimensional process.’

On the road to the super-battery

Dr. Anatoliy Senyshyn mounts a sample to analyze neutrons at the structure powder diffractometer SPODI at the Heinz Maier-Leibnitz Zentrum.
Credit: Bernhard Ludewig, FRM II /TUM

A research team led by the Technical University of Munich (TUM) has taken an in-depth look at the internal workings of batteries during charging and discharging. Their findings may help optimize charging processes.

When an electric car is being charged, the charge indicator moves quickly at first, then much more slowly at the end. "It's like putting things into a closet: In the beginning it's easy, but finding available space gets more difficult as the closet fills up," says Dr. Anatoliy Senyshyn from the Technical University of Munich's Research Neutron Source Heinz Maier-Leibnitz (FRM II).

The internal structure of a battery both before and after the charging process is already known. Led by the Heinz Maier-Leibnitz Zentrum (MLZ) at TUM, a research team has now observed for the first time a battery's lithium distribution during the entire charging and discharging process with the materials science diffractometer STRESS-SPEC. They then verified the measurements using the high-resolution powder diffractometer SPODI.

Interpreting underwater symphonies

Dr Hari Vishnu has researched on underwater soundscapes from the tropical waters of Singapore to the icy Arctic.
Credit: National University of Singapore

“The ocean is far less explored than we think. In fact, we know less about the depths of Earth’s oceans than we know about the surface of the Moon or Mars!” says Dr Hari Vishnu, Senior Research Fellow at the Acoustic Research Laboratory under the NUS Tropical Marine Science Institute, who listens to underwater sounds to discover the immense world beneath the waves.

“I study the use of sound to sense and understand underwater environments such as the ocean. Sound travels longer distances under water than light, and tells us a lot about what is happening in the ocean. I use sound-based sensing for diverse applications such as assessing Singapore’s marine biodiversity and the presence of marine mammals like dolphins and dugongs, improving capabilities of sonars used in defense applications, and deep-sea resource assessment,” shared Dr Vishnu.

With an academic background in computer engineering, as well as electrical and electronic engineering, Dr Vishnu was drawn to this area of research by his desire to make an impact on the under-explored world of the oceans: “Life originated in the oceans that cover more than 70 percent of the Earth, yet I feel it is underappreciated how crucial oceans are in determining its climate and supporting human survival. So, during my PhD, I decided to jump into this broad domain of ocean engineering. I specialized in studying how to process ocean sounds to interpret them and learn more about the ocean.”

Earth’s magnetic poles not likely to flip

Credit: ESA/ATG medialab

The emergence of a mysterious area in the South Atlantic where the geomagnetic field strength is decreasing rapidly, has led to speculation that Earth is heading towards a magnetic polarity reversal. However, a new study that pieces together evidence stretching back 9,000 years, suggests that the current changes aren’t unique, and that a reversal may not be in the cards after all. The study is published in PNAS.

The Earth’s magnetic field acts as an invisible shield against the life-threatening environment in space, and solar winds that would otherwise sweep away the atmosphere. However, the magnetic field is not stable, and at irregular intervals at an average of every 200,000 years polarity reversals happen. This means that the magnetic North and South poles swap places.

During the past 180 years, Earth’s magnetic field strength has decreased by about 10 percent. Simultaneously, an area with an unusually weak magnetic field has grown in the South Atlantic off the coast of South America. This area, where satellites have malfunctioned several times due to exposure to highly charged particles from the sun, is called the South Atlantic Anomaly. These developments have led to speculation that we may be heading for a polarity reversal. However, the new study suggests this may not be the case

Colossal collisions linked to solar system science

In this composite image of Abell 2146, Chandra X-ray data (purple) shows hot gas, and Subaru Telescope optical data shows galaxies (red and white).
Credit: Chandra X-ray / NASA

A new study shows a deep connection between some of the largest, most energetic events in the universe and much smaller, weaker ones powered by our own Sun.

The results come from a long observation with NASA’s Chandra X-ray Observatory of Abell 2146, a pair of colliding galaxy clusters located about 2.8 billion light-years from Earth. The new study was led by Helen Russell from the School of Physics and Astronomy and has been published online by The Monthly Notices of the Royal Astronomical Society

Galaxy clusters contain hundreds of galaxies and huge amounts of hot gas and dark matter and are among the largest structures in the universe. Collisions between galaxy clusters release enormous amounts of energy unlike anything witnessed since the big bang and provide scientists with physics laboratories that are unavailable here on Earth.

The shock wave is about 1.6 million light-years long and is most easily seen in a version of the X-ray image that has been processed to emphasize sharp features. Also labeled are the central core of hot gas in cluster #2, and the tail of gas it has left behind. A second shock wave of similar size is seen behind the collision. Called an “upstream shock,” features like this arise from the complex interplay of stripped gas from the infalling cluster and the surrounding cluster gas. The brightest and most massive galaxy in each cluster is also labeled.