A team of professional and amateur Japanese astronomers found evidence for a thin atmosphere around a small body in the outer Solar System, a trans-Neptunian object (TNO) known as (612533) 2002 XV₉₃. The object is so small that it should not have a sustainable atmosphere, raising questions about when and how the atmosphere formed. Future observations to better characterize the atmosphere will help solve these mysteries.

Manganese dioxide can convert amino acids into hydrogen cyanide (HCN) without requiring methane, solving a long-standing puzzle about the origin of this key prebiotic molecule on early Earth, as reported by researchers from Science Tokyo. Although HCN is central to origin-of-life theories, recent evidence suggests early Earth's atmosphere didn’t contain sufficient methane needed for classic HCN-producing reactions. The newly found chemical pathway shows that HCN could instead have been continuously supplied from abundant amino acids.

In 2026, the Arctic winter sea-ice extent (annual maximum extent ,note 1) reached the lowest value since satellite observations began in 1979 (Figure 1a), following the previous record low in March 2025.

As part of the Arctic Challenge for Sustainability III (ArCS III, note 2), the National Institute of Polar Research (NIPR) and the Japan Aerospace Exploration Agency (JAXA) maintain a long-term dataset spanning more than 40 years. This dataset is primarily based on observations from microwave radiometers, including the Advanced Microwave Scanning Radiometer 2 (AMSR2) onboard the Global Change Observation Mission – Water “SHIZUKU” (GCOM-W). The institutions contribute to monitoring polar environmental changes by visualizing temporal and spatial changes in sea ice extent in the Northern and Southern Hemispheres and making the data available on the Arctic Data archive System (ADS, note 3) website.

Diazoacetic acid esters are important intermediates in drug and agrochemical synthesis, but their preparation typically requires hazardous diazomethane. Researchers from the Tokyo University of Science developed a safer method using a Michael addition-mediated azide-to-diazo conversion. By pretreating 2-azidoacrylic acid esters with a bulky phosphine followed by nucleophile addition, they produced β-heteroatom-substituted diazo esters without toxic precursors. This simpler approach offers a practical and flexible route to access diverse organonitrogen compounds.

Water droplets might seem simple at first. But when nearing evaporation, a desperate power struggle of competing physical forces can emerge, with explosive effects. In a new Proceedings of the National Academy of Sciences publication, researchers have taken a closer look at the physics of charged water droplets on frictionless surfaces, observing spontaneous jets of microdroplet emissions. Their insights may open new opportunities in nanoscale fabrication and electrospray ionization.

Optimization isn’t always about maximization: researchers at Tohoku University found a subtle rule where a bit of restraint actually speeds up chemical reactions in nanoreactors.

Researchers from The University of Osaka, Kyushu University, and the University of Victoria have developed MV-SZZ, a new method that accurately identifies defect-inducing software commits. By combining detailed code tracking with a majority voting system, the approach reduces false positives and outperforms existing techniques. This improvement could help developers debug software more efficiently and build more reliable systems.

Mechanochemistry is a growing field for chemical reactions that proceed in the solid state in the absence, or with miniscule amounts, of solvent added. For decades, solvents have been considered conventional for the progression of modern chemistry, nonetheless, researchers are increasingly demonstrating that mechanochemistry can synthesize complex molecules more effectively. With more progress, mechanochemistry could alleviate solvent-related environmental and financial burdens in chemical industries. New research from WPI-ITbM at Nagoya University demonstrates a simple mechanochemical method for synthesizing a series of synthetically challenging conductive organic molecules.

A new study shows that how a cell fails to divide after copying its DNA can determine its fate.

Sugar-based amphiphilic molecules, which contain a hydrophilic sugar headgroup and a hydrophobic segment, can assemble in water and act at interfaces, making them important models for detergents, emulsifiers, molecular assemblies, and delivery systems. However, how small structural changes alter their aggregation and interfacial behavior remains insufficiently understood. A research team from Saitama University synthesized a series of S-linked octyl α-D-mannosides that share the same mannose headgroup and octyl chain but differ only in the oxidation state of sulfur: sulfide, sulfoxide, and sulfone. Using NMR spectroscopy, single-crystal X-ray crystallography, Nile Red fluorescence, surface tension measurements, dynamic light scattering, and transmission electron microscopy, the team showed that sulfur oxidation state changes not only the concentration at which aggregation-related behavior appears in water but also how this behavior corresponds to interfacial activity.