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Category: evolution

Moon’s thick crust could amplify elusive gravitational-wave signals

Gravitational waves are tiny ripples in the fabric of spacetime that are produced when massive objects in the cosmos accelerate or collide. By detecting these waves, astrophysicists can study various cosmic events, including black hole mergers, neutron star collisions and the early evolution of the universe.

There are several gravitational-wave observatories in different geographic regions worldwide. While these detectors are highly sensitive to the tiny changes associated with ripples in spacetime, they cannot yet detect waves across all frequency ranges.

Researchers at the Chinese Academy of Sciences and Peking University recently revisited the possibility of using the moon to amplify gravitational waves with frequencies between 0.01 and 1 hertz (Hz), a range that remains largely inaccessible to current gravitational-wave detectors.

The global biogeography of passerine songs

Although bird songs are classic models for understanding the evolution of vocal communication, their global diversity has long made the development of a unifying framework challenging. By analyzing the acoustic architecture of songs from more than 3,000 passerine species worldwide, we show that this acoustic space can be structured around eight elemental motifs. The differential use of these motifs is driven by a combination of species’ biological traits (social organization, morphology, and mating system) and the physics of sound propagation. In tropical rainforests, environmental filtering for transmission efficiency favors structurally simple motifs, such as flat whistles.

JWST captures rare glimpse of early black hole growing inside network of young galaxies

Astronomers using the James Webb Space Telescope have captured one of the clearest views yet of how an early supermassive black hole may grow within a network of young galaxies. The compact active galaxy, seen just a billion years after the Big Bang, lies beside a 12,000-parsec-long filament containing multiple galaxies that are expected to merge within a few hundred million years.

The findings, posted to the arXiv preprint server on July 6, suggest astronomers may be witnessing a short-lived phase in the evolution of rapidly growing black holes while also shedding light on how the first massive galaxies assembled in the early universe.

Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber

Kumar and his team measured entanglement fidelity above 94%, confirming it survived the journey at a level impossible for a classical communications system to reproduce.

The study is a part of a broader shift toward integrating quantum technologies with existing telecommunications systems. Kumar and coauthor Jordan Thomas recently explored that evolution in a feature article for Optics & Photonics News.

Next, the team plans to perform quantum teleportation between remote nodes across a real-world telecommunications network. While Kumar has already performed teleportation in his lab, he wants to demonstrate it over a metropolitan fiber carrying commercial traffic.

Astronomers Find Escaping Helium on Rocky World LHS 1140 b

By detecting helium escaping into space, astronomers have found the first direct evidence of an atmosphere on LHS 1,140 b, a rocky exoplanet located in its star’s habitable zone.

A collaborative team of researchers recently announced the discovery of an atmosphere on a rocky exoplanet orbiting in the habitable zone of its star. While this finding is intriguing for the search for life beyond Earth, the atmosphere is not only comprised of helium, but it was found to be escaping the exoplanet. The researchers discuss these findings in a recent study published in the journal Science and it holds the potential to help scientists better understand the formation and evolution of rocky exoplanets while narrowing the search for life beyond Earth.

For the study, the researchers analyzed data about LHS 1,140 b, which orbits a red dwarf star about 50 light-years from Earth and has a radius and mass about 1.7 and 5.6 of Earth, respectively, designating LHS 1,140 b as a super-Earth. While the researchers note this is the first time an atmosphere has been detected around a rocky exoplanet orbiting in the habitable zone of its star, LHS 1,140 b’s atmosphere is primarily comprised of helium and was also found to be escaping the exoplanet or being stripped away.

This is because red dwarf stars have been found to be significantly more active than Sun-like stars, meaning its intense radiation is potentially stripping LHS 1,140 b’s upper atmosphere where the helium is found. Despite this, the team noted other types of gases could be present in the lower altitudes of the atmosphere.

Nature Ecology & Evolution divergence

Yellow-eyed penguins, also known as hoiho or takaraka (Megadyptes antipodes, pictured), are an endangered species endemic to Aotearoa (New Zealand) with only around 3,000 individuals left in the wild, and the only living member of the genus Megadyptes. In collaboration with Ngāi Tahu iwi (tribe) of the South Island of Aotearoa, whole-genome sequencing of 249 individuals that span the entire species range has identified 3 phylogenetically distinct lineages, which suggests that they exist as 3 subspecies that have been isolated from each other for several thousand years. Genome scans also reveal candidate gene variants associated with differential susceptibility to neonatal respiratory distress syndrome.

Codon Usage Bias in Human RNA Viruses and Its Impact on Viral Translation, Fitness, and Evolution

Synonymous codon usage (codon bias) greatly influences not only translation but also mRNA stability. In vertebrates, highly expressed genes preferentially use codons with an optimal tRNA adaptation index (tAI) that mostly end in C or G. Surprisingly, the codon usage of viruses infecting humans often deviates from optimality, showing an enrichment in A/U-ending codons, which are generally associated with slow decoding and reduced mRNA stability. This observation is particularly evident in RNA viruses causing respiratory illnesses in humans. This review analyzes the mutational and selective forces that shape nucleotide composition and codon usage drift in human RNA viruses, as well as their impact on translation, viral fitness, and evolution. It also describes how some viruses overcome suboptimal codon usage to outcompete host mRNA for translation.

Host Cell Virus Interactions: Molecular Mechanisms, Immune Modulation, Viral Pathogenesis, and Emerging Therapeutic Targets

Host–virus relationships regulate every phase of viral infection and critically influence course of illness and the effectiveness of treatment. Viruses utilize host receptors, intracellular trafficking routes, metabolic programs, and immunological signaling networks to introduce infection, while host cells use innate and adaptive immune responses that both limit viral replication and, in certain situations, cause tissue damage. Given the fast viral evolution and drug resistance linked to virus-directed therapy, there is growing proof that these host-dependent mechanisms are appealing and underutilized targets for antiviral treatment.

Asteroid breakup may explain inner solar system bombardment 800 million years ago

A Southwest Research Institute-led study has proposed a connection between a specific collision in the main asteroid belt and an inner-solar-system-wide bombardment episode that may have had measurable biological and geological consequences on Earth. The research suggests that the catastrophic breakup of the Eulalia parent body could be linked to an impact shower that struck the terrestrial planets about 800 million years ago. The work is published on the arXiv preprint server.

“The role impacts have played in shaping the origin and evolution of life in our solar system is poorly understood,” said Dr. William Bottke, an executive director in SwRI’s Solar System Science and Exploration Division in Boulder, Colorado. He also directs the Center for Lunar Origin and Evolution (CLOE), SwRI’s team in NASA’s Solar System Exploration Research Virtual Institute, and is lead author of a paper describing this research. “The heavily cratered surface of the moon serves as a reminder of the large impacts in Earth’s past, but so far, only the Chicxulub impact event 66 million years ago has been strongly linked to a specific effect on life, namely the mass extinction of the dinosaurs.”

Finding geological evidence of impacts older than 650 million years ago on Earth is challenging because of the constant renewal of our home planet’s surface. Earth’s landscape constantly changes as constructive forces such as volcanoes and plate tectonics build it up, while destructive forces such as weathering wear it down. One way researchers have searched for clues about Earth’s past is to study asteroid shower events.

Quantum-gravitational mechanism could explain the universe’s homogeneity

Our universe is known to be remarkably homogeneous and isotropic. This essentially means that matter is distributed evenly throughout the universe and that it looks almost the same in all directions.

Physics theories, however, predict that in its early days, the universe may have been far less orderly, with different regions expanding at varying rates. Yet how the universe could have evolved from this potentially uneven beginning into the smoothness we observe today remains unclear.

Researchers at Baylor University, Jiangxi Normal University, State University of Rio de Janeiro and Universidade Federal Fluminense recently delineated a mechanism that could explain how the universe shifted from early unevenness (i.e., anisotropy) to its current homogeneity. Their theoretical paper, published in Physical Review Letters, models the evolution of the early universe using a framework known as the modified loop quantum cosmology (mLQC-I) model.

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